Bisphosphonate compounds

ABSTRACT

Novel bisphosphonate cyclic acetal compounds are disclosed, as well as methods of preparing the compounds, pharmaceutical compositions including the compounds, and administration of the compounds in methods of treating bone metabolism disorders, such as abnormal calcium and phosphate metabolism.

This application claims the benefit of priority from U.S. Provisional Patent Application No. 61/254,886, which was filed on Oct. 26, 2009, the contents of which are incorporated herein in their entirety.

FIELD OF THE INVENTION

Novel bisphosphonate cyclic acetal compounds are disclosed, as well as their uses as antiresorptive agents and for the treatment and prevention of disorders associated with bone metabolism, such as abnormal calcium and phosphate metabolism. Processes for preparing the novel bisphosphonate cyclic acetal compounds, as well as methods of using them and pharmaceutical compositions containing them are also disclosed.

BACKGROUND

Bisphosphonates were first developed to complex calcium in hard water to improve detergent performance. Bisphosphonates have since been found to be useful in the treatment and prevention of diseases or conditions characterized by abnormal calcium and phosphate metabolism. Such conditions may be divided into two broad categories:

1. Conditions which are characterized by anomalous mobilization of calcium and phosphate leading to general or specific bone loss or excessively high calcium and phosphate levels in the fluids of the body. Such conditions are sometimes referred to as pathological hard tissue demineralization.

2. Conditions which cause or result from deposition of calcium and phosphate anomalously in the body. These conditions are sometimes referred to as pathological calcifications.

The first category includes osteoporosis, a condition in which bone hard tissue is lost disproportionately to the development of new hard tissue ultimately resulting in fractures. Essential quantities of cancellous bone are lost, and marrow and bone spaces become larger, resulting in reduced cancellous bone strength. Bone also becomes less dense and fragile. Osteoporosis can be sub-classified as genetic, senile, drug induced (e.g., adrenocorticoid, as can occur in steroid therapy), disease induced (e.g., arthritic and tumor), etc., however the manifestations are similar. Another condition in the first category is Paget's disease (osteitis deformans). In this disease, dissolution of normal bone occurs, which is then haphazardly replaced by soft, poorly mineralized tissue such that the bone becomes deformed from pressures of weight bearing, particularly in the tibia and femur. Hyperparathyroidism, hypercalcemia of malignancy, arthritis, and osteolytic bone metastasis are conditions also included in the first category.

The second category, involving conditions manifested by anomalous calcium and phosphate deposition, includes myositis ossificans progressiva, calcinosis universalis, and such afflictions as arthritis, neuritis, bursitis, tendonitis, and other inflammatory conditions which predispose involved tissue to deposition of calcium phosphates.

A variety of polyphosphonic acid derivatives have been proposed for use in the treatment and prophylaxis of conditions involving abnormal calcium and phosphate metabolism. For example, diphosphonates, like ethane-1-hydroxy-1,1-diphosphonic acid (EHDP), propane-3-amino-1-hydroxy-1,1-diphosphonic acid (APD), and dichloromethane diphosphonic acid (Cl₂MDP), have been the subject of considerable research efforts in this area. Paget's disease and heterotopic ossification have been treated with EHDP. Similarly, risedronate and alendronate have been used for treatment of bone disorders, U.S. Pat. No. 4,990,503 discloses heterocyclic bisphosphonic acid derivatives and their use as bone resorption inhibitors, and U.S. Pat. No. 7,745,422 teaches bisphosphonate derivatives for use in bone resorption and bone pain. However, these patents fail to teach bisphosphonate cyclic acetal compounds. U.S. Pat. No. 5,719,303 discloses bisphosphonic acid derivatives, and one bisphosphonic cyclic acetal, Example No. 471. This example, however, has a chemical structure unlike the bisphosphonate cyclic acetals disclosed herein and, in vivo, would not likely release an effective amount of the bisphosphonate.

However, bisphosphonates suffer from side effects and pharmacological disadvantages as orally administered agents. Some of the currently available bisphosphonates, e.g., alendronate, tiludronate, and risedronate, may cause esophageal irritation and ulceration. Therefore, it is recommended that the patients remain upright for 30 minutes after taking the medication. In addition, bisphosphonates usually have very low oral bioavailability: generally only 0.2% to 5% of an orally administered bisphosphonate is absorbed from the gastrointestinal tract. Bisphosphonates are usually very polar and can easily become negative charged, thus preventing absorption through paracellular transportation. They also have very low affinity to lipids, which makes it difficult for bisphosphonates to move across the cell membrane. Oral absorption is further reduced when taken with food, especially food rich in calcium. This “food effect” phenomenon can be explained by the formation of insoluble calcium salts of bisphosphonic acids which remain in the digestive tract without any detectable absorption. Bisphosphonic acids are known strong chelators of metal ions, including calcium, due to the presence of four acidic groups and a alpha-hydroxy substituent, when present. For example, with the calcium salts of alpha-hydroxybisphosphonic acids, the crystal structures show that the calcium ion is bound to two acidic hydroxyl groups from the different phosphate moieties and to the alpha-hydroxyl group. Therefore, there remains a need to develop bisphosphonates that maintain or enhance the pharmacological activity with fewer side effects and better absorption profiles.

Farnesyl pyrophosphate synthase (FPPS) is a key regulatory enzyme in the mevalonate pathway. This pathway, ubiquitous in mammalian cells, provides essential lipid molecules, such as cholesterol and isoprenoids, with isoprenoids being necessary for posttranslational prenylation of small GTPases. The blockage of this pathway is a concept that has found widespread clinical use, with statins as drugs that inhibit hydroxymethylglutaryl CoA reductase and reduce cholesterol biosynthesis, and nitrogen-containing bisphosphonates (N—BPs) as drugs for osteoporosis therapy that target FPPS and inhibit protein prenylation. In the case of N—BPs, the unique bone-targeting pharmacokinetic properties of these compounds cause selected inhibition of FPPS and loss of prenylated proteins in osteoclasts, thereby inhibiting the bone-destroying function of these cells.

SUMMARY OF THE INVENTION

The bisphosphonate cyclic acetal compounds described herein are useful in the treatment and/or prevention of disorders associated with bone metabolism, such as abnormal calcium and phosphate metabolism, including bone and joint diseases such as osteoporosis, rheumatoid arthritis, osteoarthritis, Paget's disease, bone related and other cancer therapy, orthopedic disorders, and alveolar bone loss often associated with periodontal disease. The nitrogen-containing bisphosphonates (N—BPs) have the ability to inhibit the resorption of bone tissue and are inhibitors of farnesyl pyrophosphate synthase (FPPS). Furthermore, such compounds correspondingly have orthopedic uses (including, but not restricted to, fracture repair and implant fixation; and prevention of prosthesis loosening, and osteonecrosis of various bones). Other uses include immunomodulation and anti-inflammatory effects, and use in various parasitic disorders (e.g., malaria, leishmaniasis, trypanasomal diseases, entamoeba, giardia, and cryptosporidial infections). The cyclic acetal functionality of the bisphosphonate cyclic acetal compounds described herein is cleaved in vivo to release the tetra acid bisphosphonates often at a different rate than direct introduction of the tetra acid bisphosphonate into the bloodstream.

In one aspect, compounds of Formula I are described herein:

where R₁, R₂, R₃, R₄, and R₅ are as described herein.

In some embodiments, compositions including a compound of Formula I and one or more pharmaceutically acceptable carriers are described herein.

In other embodiments, the method includes the step of administering to the patient a therapeutically effective amount of a compound of Formula I.

In another aspect, compounds of Formula II are described herein:

where A, B, and C are as described herein.

In some embodiments, compositions including a compound of Formula II and one or more pharmaceutically acceptable carriers are described herein.

In other embodiments, methods of treating and/or preventing a disorder associated with abnormal calcium and phosphate metabolism are described herein, including the step of administering to the patient a therapeutically effective amount of a compound of Formula II.

In yet another aspect, compounds of Formula III are described herein:

where R₁, R₂, R₃, R₄, R₅, R₉, and R₁₀ are as described herein.

In some embodiments, compositions including a compound of Formula III and one or more pharmaceutically acceptable carriers are described herein.

In other embodiments, methods of treating and/or preventing a disorder associated with abnormal calcium and phosphate metabolism are described herein, including the step of administering to the patient a therapeutically effective amount of a compound of Formula III.

In another aspect, compounds of Formula IV are described herein:

where A, B, and C are as described herein.

In some embodiments, compositions including a compound of Formula IV and one or more pharmaceutically acceptable carriers are described herein.

In other embodiments, methods of treating and/or preventing a disorder associated with abnormal calcium and phosphate metabolism are described herein, including the step of administering to the patient a therapeutically effective amount of a compound of Formula IV.

As used herein, the exposure of risedronate after intravenous (IV) or oral (PO) administration of risedronate or a risedronate cyclic acetal compound is defined by the percentage of the risedronate recovered from a urine sample based on the amount of risedronate or risedronate cyclic acetal dosed.

As used herein, the compound(s) of the invention include compound(s) of Formula I, II, IIa, IIb, IIc, IId, IIe, III, IV, IVa, IVb, IVc, IVd, IVe or IVf.

As used herein, the gastrointestinal stability of the bisphosphonate refers to the stability of the bisphosphonate cyclic acetal in the presence of acidic gastric fluid in the stomach. As used herein, the systemic stability of the bisphosphonate cyclic acetal refers to the stability of the bisphosphonate cyclic acetal towards metabolic or chemical conversions to risedronate after entering into systemic circulation via absorption or injection.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 shows the amount of urinary excretion of risedronate after intravenous (IV) administration of risedronate and of the trans isomer of Example 62 in rats over time.

DETAILED DESCRIPTION

Novel bisphosphonate cyclic acetal compounds are disclosed. The compound(s) of the invention include compound(s) of Formula I, II, IIa, IIb, IIc, IId, IIe, III, IV, IVa, IVb, IVc, IVd, IVe, or IVf. In the bisphosphonate cyclic acetal, the bisphosphonic acid functionality is “masked” as a cyclic acetal moiety which results in an increase of the lipophilicity of the molecule, thus improving the absorption profile of the bisphosphonates. The cyclic acetal moiety in bisphosphonate cyclic acetal molecules also prevents the chelation of the bisphosphonates with metal ions such as calcium in milk and other calcium-containing food by blocking two hydroxy groups from the bisphosphonate (one from each phosphonate moiety). Therefore, the bisphosphonate compounds described herein are likely to have a decreased “food effect” derived absorption loss. Also, the bisphosphonate compounds described herein are less likely to interact with the GI surface similarly to unmasked bisphosphonates and therefore are less likely to be associated with GI irritation. Since the acetal linkage is hydrolytically labile, the cyclic acetal moiety in bisphosphonate cyclic acetal compounds described herein can be cleaved under in vivo conditions, thereby releasing the tetra acid bisphosphonates after absorption.

The term “halogen” as used herein refers to F, Cl, Br, or I.

The term “alkyl” as used herein refers to a linear, branched, or cyclic saturated hydrocarbon having from 1 to 20 carbon atoms. The term “C₁-C₈ alkyl” as used herein refers to a linear, branched, or cyclic saturated hydrocarbon having from 1 to 8 carbon atoms. Representative C₁-C₈ alkyl groups include, but are not limited to, methyl, ethyl, propyl, isopropyl, cyclopropyl, butyl, sec-butyl, iso-butyl, tert-butyl, cyclobutyl, pentyl, iso-pentyl, neo-pentyl, tert-pentyl, cyclopentyl, hexyl, cyclohexyl, heptyl, cycloheptyl, octyl, sec-octyl (1-methylheptyl), and cyclooctyl.

The term “C₁-C₈ haloalkyl” as used herein refers to a C₁-C₈ alkyl as defined above, with one or more hydrogens substituted by halogen atoms.

The term “alkenyl” as used herein refers to a linear, branched, or cyclic unsaturated hydrocarbon having from 2 to 20 carbon atoms and at least one carbon-carbon double bond. The term “C₂-C₈ alkenyl” as used herein refers to a linear, branched, or cyclic unsaturated hydrocarbon having from 2 to 8 carbon atoms and at least one carbon-carbon double bond.

The term “C₂-C₈ haloalkenyl” as used herein refers to a C₂-C₈ alkenyl as defined above, with one or more hydrogens substituted by halogen atoms.

The term “alkynyl” as used herein refers to a linear, branched, or cyclic unsaturated hydrocarbon having from 2 to 20 carbon atoms and at least one carbon-carbon triple bond. The term “C₂-C₈ alkynyl” as used herein refers to a linear, branched, or cyclic unsaturated hydrocarbon having from 2 to 8 carbon atoms and at least one carbon-carbon triple bond.

The term “C₂-C₈ haloalkynyl” as used herein refers to a C₂-C₈ alkynyl as defined above, with one or more hydrogens substituted by halogen atoms.

Similarly, the term “C₁-C₄ alkyl” as used herein refers to a linear, branched, or cyclic saturated hydrocarbon having from 1 to 4 carbon atoms. Representative C₁-C₄ alkyl groups include, but are not limited to, methyl, ethyl, propyl, isopropyl, cyclopropyl, butyl, sec-butyl, iso-butyl, tert-butyl, and cyclobutyl.

Similarly, the term “C₁-C₃ alkyl” as used herein refers to a linear, branched, or cyclic saturated hydrocarbon having from 1 to 3 carbon atoms. Representative C₁-C₃ alkyl groups include, but are not limited to, methyl, ethyl, propyl, isopropyl, and cyclopropyl.

The term “alkoxyl” as used herein refers to an alkyl group linked to an oxygen. Similarly, the term “C₁-C₈ alkoxyl” as used herein refers to a C₁-C₈ alkyl group linked to an oxygen.

The term “acyl” as used herein refers to a group containing the acyl radical (CH₃CO—) or a carbonyl group, compounds and moities which contain a carbon connected with a double bond to an oxygen.

Unless otherwise specifically defined, the term “aryl” refers to cyclic, aromatic hydrocarbon groups that have 1 to 2 aromatic rings, including monocyclic or bicyclic groups such as phenyl, biphenyl or naphthyl. Where containing two aromatic rings (bicyclic, etc.), the aromatic rings of the aryl group may be joined at a single point (e.g., biphenyl), or fused (e.g., naphthyl). The aryl group may be optionally substituted by one or more substituents, e.g., 1 to 5 substituents, at any point of attachment. The substituents can themselves be optionally substituted.

Unless otherwise specifically defined, the term “heteroaryl” refers to aryls as defined above where one or more carbons are substituted by heteroatoms. Exemplary heteroatoms include, but not limited to, nitrogen, sulfur, and oxygen.

The term “carbocyclic ring” refers to cyclic compounds containing only carbon atoms. The carbocyclic ring may be optionally substituted by one or more substituents, and may be saturated, unsaturated or aromatic.

The term “heterocyclic ring” refers to cyclic compounds where one or more carbons are substituted by heteroatoms. Exemplary heteroatoms include, but not limited to, nitrogen, sulfur, and oxygen. The heterocyclic ring may be optionally substituted, and may be saturated, unsaturated or aromatic.

The term “saturated” as used herein means that the compound does not contain double or triple bonds. The term “unsaturated” as used herein means that the compound contains at least one double or triple bond. The term “aromatic” as used herein means that the compound contains alternating double and single bonds.

The term “optionally substituted” as used herein means that the compounds may contain one or more substituents, including, but not limited to, optionally substituted alkyl, alkenyl, C₁-C₈ haloalkyl, alkynyl, alkoxyl, acyl, halogen, aryl, carbocyclic or heterocyclic ring, —NH₂, —NH-alkyl, —N-(alkyl)₂, —C(═NH)—NH₂, —C(═N—OH)—NH₂, —C(═NH)—NH—OH, —C(═NH)—NH—C(═O)—O-alkyl, —COOH, —C(═O)—O-optionally substituted alkyl, —C(═O)—O-optionally substituted aryl, —C(═O)—O-optionally substituted heteroaryl, —CN, —NO₂, —OH, —O—CO-optionally substituted alkyl, —O—CO—NH₂, —O—CO—NH-alkyl, —O—CO—N-(alkyl)₂, —SH, —C(═O)—NH₂, —C(═O)—NH-(lower alkyl) and —C(═O)—N-(lower alkyl)₂.

The carbon number, as used herein, refers to the carbon backbone and carbon branching, but does not include carbon atoms of the substituents, such as alkoxy substitutions and the like.

The term “administer”, “administering”, or “administration”, as used herein refers to administering a compound or pharmaceutically acceptable salt or hydrate of the compound or a composition to an animal.

The term “animal” as used herein includes, without limitation, a human, mouse, rat, guinea pig, dog, cat, horse, cow, pig, monkey, chimpanzee, baboon, or rhesus monkey. In one embodiment, the animal is a mammal. In another embodiment, the animal is a human.

The term “conditions effective to” as used herein refers to synthetic reaction conditions that will be apparent to those skilled in the art of synthetic organic chemistry.

The term “effective amount” as used herein refers to an amount of a compound or pharmaceutically acceptable salt or hydrate of a compound that, when administered to an animal, is effective to prevent, to at least partially ameliorate, or to cure, a condition from which the animal suffers or is suspected to suffer.

The term “pharmaceutically acceptable salt”, as used herein, refers to salts derived from organic and inorganic acids of a compound described herein. Exemplary salts include, but are not limited to, sulfate, citrate, acetate, oxalate, chloride, hydrochloride, bromide, hydrobromide, iodide, nitrate, bisulfate, phosphate, acid phosphate, isonicotinate, lactate, salicylate, acid citrate, tartrate, oleate, tannate, pantothenate, bitartrate, ascorbate, succinate, maleate, gentisinate, fumarate, gluconate, glucaronate, saccharate, formate, benzoate, glutamate, methanesulfonate, ethanesulfonate, benzenesulfonate, p-toluenesulfonate, camphorsulfonate, napthalenesulfonate, propionate, succinate, fumarate, maleate, malonate, mandelate, malate, phthalate, and pamoate. The term “pharmaceutically acceptable salt” as used herein also refers to a salt of a compound described herein having an acidic functional group, such as a carboxylic acid functional group, and a base. Exemplary bases include, but are not limited to, hydroxide of alkali metals including sodium, potassium, and lithium; hydroxides of alkaline earth metals such as calcium and magnesium; hydroxides of other metals, such as aluminum and zinc; ammonia, organic amines such as unsubstituted or hydroxyl-substituted mono-, di-, or tri-alkylamines, dicyclohexylamine; tributyl amine; pyridine; N-methyl, N-ethylamine; diethylamine; triethylamine; mono-, bis-, or tris-(2-OH—(C₁-C₆)-alkylamine), such as N,N-dimethyl-N-(2-hydroxyethyl)amine or tri-(2-hydroxyethyl)amine; N-methyl-D-glucamine; morpholine; thiomorpholine; piperidine; pyrrolidine; and amino acids such as arginine, lysine, and the like. The term “pharmaceutically acceptable salt” also includes hydrates of a salt of a compound described herein.

The term “hydrate”, as used herein, refers to a compound formed by the addition of water. The hydrates may be obtained by any known method in the art by dissolving the compounds in water and recrystallizing them to incorporate water into the crystalline structure.

The term “carrier”, as used herein, shall encompass carriers, excipients, and diluents.

When ranges are used herein for physical properties, such as molecular weight, or chemical properties, such as chemical formulae, all combinations and subcombinations of ranges of specific embodiments therein are intended to be included.

The disclosure of each patent, patent application, and publication cited or described in this document is hereby incorporated by reference, in their entirety.

Compounds

In one aspect, compounds of Formula I or a pharmaceutically-acceptable salt or hydrate thereof are provided:

where R₁, R₂, R₃, R₄ and R₅ are each independently:

-   a) hydrogen; -   b) halogen, —CN, —CF₃, or —NO₂; -   c) C₁-C₈ alkyl or C₁-C₈ haloalkyl; -   d) C₂-C₈ alkenyl or C₂-C₈ haloalkenyl; -   e) C₂-C₈ alkynyl or C₂-C₈ haloalkynyl; -   f) optionally substituted aryl or optionally substituted heteroaryl; -   g) —C(O)R₆; -   h) —C(O)OR₆, or —CO₂R₆; -   i) —OR₆, —O-L-OC(O)R₆, or —O-L-OC(O)OR₆; -   j) —OC(O)R₆, or —OC(O)-L-OC(O)R₆; -   k) —OC(O)OR₆, —OC(O)O-L-C(O)R₇, —OC(O)O-L-C(O)OR₇, or -L-OC(O)R₆; -   l) —C(O)NR₆R₇, or —CNR₆R₇; -   m) —OC(O)NR₆R₇, —OC(O)N(R₆)-L-OC(O)R₇, —OC(O)O-L-(R₆)-L-C(O)R₇,     —OC(O)—C(R₆)(R₇)-L-OC(O)R₈, —OC(O)N(-L-OC(O)R₇)(-L-OC(O)R₈); -   n) —SR₆, or —NR₆R₇; -   o) —NR₆C(O)R₇; -   p) —NR₆C(O)OR₇; -   q) —NR₆C(O)NR₇; -   r) —OSO₂R₆; -   s) —SO₂OR₆; -   t) —SO₂R₆; -   u) —NR₆SO₂R₇; -   v) —SO₂NR₆R₇;

or

-   bb) R₁ and R₂, R₂ and R₃, R₃ and R₄, or R₄ and R₅ taken together     form an optionally substituted 4- to 8-membered carbocyclic or     heterocyclic ring, wherein the ring is saturated, unsaturated or     aromatic; -   wherein m and n are each independently an integer from 0 to 2; -   Y is —CH₂—, —O—, —NR₇—, or —S—; -   p is an integer from 1 to 3; -   R₁₄ is hydrogen, halogen, C₁-C₈ alkyl, or C₁-C₈ alkoxyl; -   Z is

each R₆ is independently hydrogen, C₁-C₈ alkyl, C₁-C₈ haloalkyl, C₂-C₈ alkenyl, C₂-C₈ haloalkenyl, C₂-C₈ alkynyl, C₂-C₈ haloalkynyl, an optionally substituted 4-8 membered saturated carbocyclic or heterocyclic ring, optionally substituted aryl, optionally substituted heteroaryl, -L-optionally substituted aryl or -L-optionally substituted heteroaryl;

-   R₇ and R₈ are each independently hydrogen or C₁-C₈ alkyl; and L is     C₁-C₈ alkyl; or -   R₆ and R₇ taken together form an optionally substituted 4- to     8-membered carbocyclic or heterocyclic ring, wherein the ring is     saturated, unsaturated or aromatic.

In some embodiments, R₁, R₂, R₃, R₄, and R₅ are each independently hydrogen, halogen, —CF₃, C₁-C₈ alkyl, optionally substituted phenyl, —OR₆, —O-L-OC(O)R₆, —O-L-OC(O)OR₆, —OC(O)R₆, —OC(O)-L-OC(O)R₆, —C(O)OR₆, —OC(O)OR₆, —OC(O)O-L-C(O)R₇, —OC(O)NR₆R₇, —OC(O)N(R₆)-L-OC(O)R₇, —OC(O)N(-L-OC(O)R₇)(-L-OC(O)R₈),

wherein Y is —CH₂—, —O—, —NR₇—, or —S—; p is an integer from 1 to 3; R₁₄ is hydrogen, halogen, C₁-C₈ alkyl, or C₁-C₈ alkoxyl; Z is N or CH; and R₆, R₇, R₈, L, m and n are as defined above.

In some embodiments, R₁, R₂, R₃, R₄, and R₅ are each independently —OR₆, —O—(CH₂)_(p)—OC(O)R₆, —O—(CH₂)_(p)—OC(O)OR₆, —OC(O)R₆, —OC(O)—C(R₆)(R₇)—(CH₂)_(p)—OC(O)R₈, —C(O)OR₆, —OC(O)OR₆, —OC(O)O—CH(R₆)(CH₂)_(p)C(O)R₇, —OC(O)NR₆R₇, —OC(O)N(R₆)(CH₂)_(p)—OC(O)R₇, —OC(O)N(—(CH₂)_(p)—OC(O)R₇)(—(CH₂)_(p)—OC(O)R₈),

and R₆, R₇, R₈, L, Y, m, n, and p are as defined above.

In some embodiments, R₆ is C₁-C₈ alkyl, C₂-C₈ alkenyl, C₃-C₆ cycloalkyl, benzyl; R₇ and R₈ are each independently hydrogen, methyl, or ethyl; Y is —O—; and L is C₁-C₃ alkyl. In a specific embodiment, m is 0 and n is 0 or 1.

In some embodiments, R₁ and R₂, R₂ and R₃, R₃ and R₄, or R₄ and R₅ taken together form an optionally substituted 5- to 7-membered carbocyclic or heterocyclic ring, wherein the ring is saturated, unsaturated or aromatic. In certain specific embodiments, the 5- to 7-membered carbocyclic or heterocyclic ring is unsubstituted. In other specific embodiments, the 5- to 7-membered carbocyclic or heterocyclic ring is saturated or aromatic. In yet other specific embodiments, the 5- to 7-membered heterocyclic ring includes 1 or 2 heteroatoms. In yet other specific embodiments, R₁ and R₂, R₂ and R₃, R₃ and R₄, or R₄ and R₅ taken together form

and n and m are as defined above. In yet other specific embodiments, R₁ and R₂, R₂ and R₃, R₃ and R₄, or R₄ and R₅ taken together are

In yet other specific embodiments, R₁ and R₂, R₂ and R₃, R₃ and R₄, or R₄ and R₅ taken together are

and the remaining R-groups of R₁, R₂, R₃, R₄, and R₅ are each hydrogen. In yet other specific embodiments, R₁ and R₂, R₂ and R₃, R₃ and R₄, or R₄ and R₅ taken together are

wherein R₁₅ is hydrogen, halogen, or —OR₆. In yet other specific embodiments, R₁ and R₂, R₂ and R₃, R₃ and R₄, or R₄ and R₅ taken together are

and the remaining R-groups of R₁, R₂, R₃, R₄, and R₅ are each independently —H or —OC(O)OR₆.

In some embodiments, one of R₁, R₂, R₃, R₄, and R₅ is —OR₆, —O-L-OC(O)R₆, —O-L-OC(O)OR₆, —OC(O)R₆, —OC(O)-L-OC(O)R₆, —OC(O)OR₆, —OC(O)O-L-C(O)R₇, —OC(O)NR₆R₇, —OC(O)N(R₆)-L-OC(O)R₇, —OC(O)N(-L-OC(O)R₇)(-L-OC(O)R₈),

any two of the remaining groups of R₁, R₂, R₃, R₄, and R₅ are halogen; each of the remaining R-groups of R₁, R₂, R₃, R₄, and R₅ are hydrogen; and R₆, R₇, R₈, L, Z, Y, m, n, and p are as defined above.

In some embodiments, one of R₁, R₂, R₃, R₄, and R₅ is —OR₆, —O-L-OC(O)R₆, —O-L-OC(O)OR₆, —OC(O)R₆, —OC(O)-L-OC(O)R₆, —OC(O)OR₆, —OC(O)O-L-C(O)R₇, —OC(O)NR₆R₇, —OC(O)N(R₆)-L-OC(O)R₇, —OC(O)N(-L-OC(O)R₇)(-L-OC(O)R₈),

one of the remaining R-groups of R₁, R₂, R₃, R₄, and R₅ is halogen, —CF₃, C₁-C₈ alkyl, phenyl,

-   —OR₆, or —C(O)OR₆; and each remaining R-group of R₁, R₂, R₃, R₄, and     R₅ is hydrogen; and R₆, R₇, R₈, L, Z, Y, m, n, and p are as defined     above.

In some embodiments, one of R₁, R₂, R₃, R₄, and R₅ is —OR₆, —O-L-OC(O)R₆, —O-L-OC(O)OR₆, —OC(O)R₆, —OC(O)-L-OC(O)R₆, —OC(O)OR₆, —OC(O)O-L-C(O)R₇, —OC(O)NR₆R₇, —OC(O)N(R₆)-L-OC(O)R₇, —OC(O)N(-L-OC(O)R₇)(-L-OC(O)R₈),

the remaining R-groups of R₁, R₂, R₃, R₄, and R₅ are each hydrogen; and R₆, R₇, R₈, L, Z, Y, m, n, and p are as defined above.

In some embodiments, R₁ and R₅ are each independently halogen; and R₃ is —OR₆, —O-L-OC(O)R₆, —O-L-OC(O)OR₆, —OC(O)R₆, —OC(O)-L-OC(O)R₆, —OC(O)OR₆, —OC(O)O-L-C(O)R₇, —OC(O)NR₆R₇, —OC(O)N(R₆)-L-OC(O)R₇, —OC(O)N(-L-OC(O)R₇)(-L-OC(O)R₈),

the remaining R-groups of R₁, R₂, R₃, R₄, and R₅ are each hydrogen; and R₆, R₇, R₈, L, Z, Y, m, n, and p are as defined above. In certain specific embodiments, R₁ and R₅ are each independently —F or —Cl.

In some embodiments, R₁ is —OR₆, —O-L-OC(O)R₆, —O-L-OC(O)OR₆, —OC(O)R₆, —OC(O)-L-OC(O)R₆, —OC(O)OR₆, —OC(O)O-L-C(O)R₇, —OC(O)NR₆R₇, —OC(O)N(R₆)-L-OC(O)R₇, —OC(O)N(-L-OC(O)R₇)(-L-OC(O)R₈),

one of the remaining R-groups of R₁, R₂, R₃, R₄, and R₅ is halogen, —CF₃, C₁-C₈ alkyl, phenyl, —OR₆, or —C(O)OR₆; each remaining R-group of R₁, R₂, R₃, R₄, and R₅ is hydrogen; and R₆, R₇, R₈, L, Z, Y, m, n, and p are as defined above.

In some embodiments, R₅ is —OR₆, —O-L-OC(O)R₆, —O-L-OC(O)OR₆, —OC(O)R₆, —OC(O)-L-OC(O)R₆, —OC(O)OR₆, —OC(O)O-L-C(O)R₇, —OC(O)NR₆R₇, —OC(O)N(R₆)-L-OC(O)R₇, —OC(O)N(-L-OC(O)R₇)(-L-OC(O)R₈),

one of the remaining R-groups of R₁, R₂, R₃, R₄, and R₅ is halogen, —CF₃, C₁-C₈ alkyl, phenyl, —OR₆, or —C(O)OR₆; each remaining R-group of R₁, R₂, R₃, R₄, and R₅ is hydrogen; and R₆, R₇, R₈, L, Z, Y, m, n, and p are as defined above.

In some embodiments, R₃ is —OR₆, —O-L-OC(O)R₆, —O-L-OC(O)OR₆, —OC(O)R₆, —OC(O)-L-OC(O)R₆, —OC(O)OR₆, —OC(O)O-L-C(O)R₇, —OC(O)NR₆R₇, —OC(O)N(R₆)-L-OC(O)R₇, —OC(O)N(-L-OC(O)R₇)(-L-OC(O)R₈),

one of the remaining R-groups of R₁, R₂, R₃, R₄, and R₅ is halogen, —CF₃, C₁-C₈ alkyl, phenyl, —OR₆, or —C(O)OR₆; each remaining R-group of R₁, R₂, R₃, R₄, and R₅ is hydrogen; and R₆, R₇, R₈, L, Z, Y, m, n, and p are as defined above.

In some embodiments, R₁ is —OR₆, —O-L-OC(O)R₆, —O-L-OC(O)OR₆, —OC(O)R₆, —OC(O)-L-OC(O)R₆, —OC(O)OR₆, —OC(O)O-L-C(O)R₇, —OC(O)NR₆R₇, —OC(O)N(R₆)-L-OC(O)R₇, —OC(O)N(-L-OC(O)R₇)(-L-OC(O)R₈),

R₂, R₃, R₄, and R₅ are each hydrogen; and R₆, R₇, R₈, L, m and n are as defined above. In certain specific embodiments, R₁ is —OC(O)OR₁₆, —OC(O)R₁₆ or —OC(O)NR₁₆R₁₇ and R₁₆ and R₁₇ are each independently C₁-C₄ alkyl.

In some embodiments, R₃ is —OR₆, —O-L-OC(O)R₆, —O-L-OC(O)OR₆, —OC(O)R₆, —OC(O)-L-OC(O)R₆, —OC(O)OR₆, —OC(O)O-L-C(O)R₇, —OC(O)NR₆R₇, —OC(O)N(R₆)-L-OC(O)R₇, —OC(O)N(-L-OC(O)R₇)(-L-OC(O)R₈),

R₁, R₂, R₄, and R₅ are each hydrogen; and R₆, R₇, R₈, L, Z, Y, m, n, and p are as defined above. In certain specific embodiments, R₃ is —OC(O)OR₁₆, —OC(O)R₁₆ or —OC(O)NR₁₆R₁₇ and R₁₆ and R₁₇ are each independently C₁-C₄ alkyl.

In certain embodiments, R₁ is —OC(O)R₆ or —OC(O)OR₆ and R₂, R₃, R₄ and R₅ are each independently hydrogen, halogen, —CF₃, C₁-C₈ alkyl, optionally substituted phenyl, —OR₆, or —C(O)OR₆. Preferably, R₂, R₃, R₄ and R₅ are each hydrogen. In some preferred embodiments, R₂, R₃, R₄ and R₅ are each hydrogen, R₁ is —OC(O)OR₆ and R₆ is C₁-C₈ alkyl, and more preferred, R₆ is C₁-C₃ alkyl.

In certain embodiments, R₁ is —OC(O)OR₆ or —OC(O)OR₆ and R₂, R₃, R₄ and R₅ are each hydrogen. More preferably, R₁ is —OC(O)OR₆, R₂, R₃, R₄ and R₅ are each hydrogen, and R₆ is C₁-C₈ alkyl. In other certain embodiments, R₁ is —OC(O)OCH₃, —OC(O)OCH₂CH₃ or —OC(O)OCH(CH₃)₂; and R₂, R₃, R₄ and R₅ are each independently hydrogen, halogen, —CF₃, C₁-C₈ alkyl, optionally substituted phenyl, —OR₆, or —C(O)OR₆. In a preferred embodiment R₁ is —OC(O)OCH₃ or —OC(O)OCH(CH₃)₂; and R₂, R₃, R₄ and R₅ are each independently hydrogen, halogen, or —CF₃.

In some embodiments, specific examples of compounds or pharmaceutically acceptable salts or hydrates of the compounds of Formula I include, without limitation:

In another aspect, compounds of Formula II or a pharmaceutically-acceptable salt or hydrate thereof are provided:

where A is —OR₆, —CO₂R₆, -L-OC(O)R₆, —O-L-OC(O)R₆, —O-L-OC(O)OR₆, —OC(O)R₆, —OC(O)-L-OC(O)R₆, —OC(O)OR₆, —OC(O)O-L-C(O)R₇, —OC(O)O-L-C(O)OR₇, —C(O)NR₆R₇, —CNR₆R₇, —OC(O)NR₆R₇, —OC(O)N(R₆)-L-OC(O)R₇, —OC(O)N(-L-OC(O)R₇)(-L-OC(O)R₈),

and

-   B and C are each independently hydrogen, halogen, —CF₃, —CN, C₁-C₈     alkyl, phenyl, —OR₆, or —C(O)OR₆, or B and C when taken together     form an optionally substituted 4- to 8-membered carbocyclic or     heterocyclic ring, wherein the ring is saturated, unsaturated or     aromatic;     wherein m and n are each independently an integer from 0 to 2; Y is     —CH₂—, —O—, —NR₇—, or —S—; p is an integer from 1 to 3;     Z is

each R₆ is independently hydrogen, C₁-C₈ alkyl, C₁-C₈ haloalkyl, C₂-C₈ alkenyl, C₂-C₈ haloalkenyl, C₂-C₈ alkynyl, C₂-C₈ haloalkynyl, an optionally substituted 4-8 membered saturated carbocyclic or heterocyclic ring, optionally substituted aryl, optionally substituted heteroaryl, -L-optionally substituted aryl or -L-optionally substituted heteroaryl; L is C₁-C₈ alkyl; R₁₄ is hydrogen, halogen, C₁-C₈ alkyl, or C₁-C₈ alkoxyl; R₇ and R₈ are each independently hydrogen or C₁-C₈ alkyl; or R₆ and R₇ taken together form an optionally substituted 4- to 8-membered carbocyclic or heterocyclic ring, wherein the ring is saturated, unsaturated or aromatic.

In some embodiments, A is in the ortho or para position relative to C. In other embodiments, A is in the meta position relative to C.

In some embodiments, the compound provided is a compound or a pharmaceutically acceptable salt or hydrate of a compound of Formula IIa, IIb, IIc, IId, or IIe:

In some embodiments, A is —OC(O)NR₆R₇, —OC(O)R₆, or —OC(O)OR₆.

In some embodiments, R₆ and R₇ are each independently hydrogen or C₁-C₈ alkyl.

In some embodiments, B and C are each independently hydrogen, cyano, halogen, or —OC(O)R₆.

In some embodiments, B and C are each independently halogen.

In some embodiments, B and C are each fluoro.

In some embodiments, R₆ is hydrogen, methyl, ethyl, propyl, isopropyl, tert-butyl, —CH₂CH(CH₃)₂, pentyl, —CH₂C(CH₃)₃, heptyl, —CH(CH₃)(CH₂)₅CH₃, —CH═C(CH₃)₂, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, benzyl, or tetrahydro-2H-pyranyl.

In some embodiments, R₆ is hydrogen, methyl, ethyl, propyl, isopropyl, tert-butyl, —CH₂CH(CH₃)₂, pentyl, —CH₂C(CH₃)₃, heptyl, —CH(CH₃)(CH₂)₅CH₃, —CH═C(CH₃)₂, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, benzyl, or tetrahydro-2H-pyranyl; and R₇ and R₈ are each independently hydrogen, methyl, ethyl, propyl, isopropyl, tert-butyl.

In some embodiments, L is C₁-C₃ alkyl.

In some embodiments, a pharmaceutical composition including a compound or a pharmaceutically acceptable salt or hydrate of a compound of Formula I or II and a pharmaceutically acceptable carrier is provided. Preferably, the compound of Formula I or Formula II is selected from one of the specific embodiments disclosed above, and, more preferably, the compound is selected from the examples of compounds listed above.

In some embodiments, the pharmaceutical composition further comprises at least one pharmaceutically active ingredient selected from the group consisting of: an anti-inflammatory, an immunomodulator, a chelator, a musculoskeletal anabolic agent, and a combination thereof.

In yet another aspect, a method of treating or preventing disorders associated with abnormal calcium and phosphate metabolism is disclosed, including administering an effective amount of a compound of Formula I or Formula II, or a pharmaceutically acceptable salt or hydrate thereof to a patient in need of such treatment. Preferably, the compound of Formula I or Formula II is selected from one of the specific embodiments disclosed above, and, more preferably, the compound is selected from the examples of compounds listed above.

In certain specific embodiments of the method of treating or preventing disorders associated with abnormal calcium and phosphate metabolism, the disorder associated with abnormal calcium and phosphate metabolism is osteoporosis, rheumatoid arthritis, osteoarthritis, Paget's disease, alveolar bone loss, bone related cancer, or an orthopedic disorder. In other embodiments, the disorder is a non-skeletal disorder selected from the group consisting of a non-bone cancer, an inflammatory disorder, an immunomodulatory disorder, and a parasitic disorder.

In further embodiments, the parasitic disorder is selected from the group consisting of malaria, leishmaniasis, a trypanasomal disease, an entamoebal infection, a giardia infection, and a cryptosporidial infection.

In other embodiments of the method of treating or preventing disorders associated with abnormal calcium and phosphate metabolism, the compound of Formula I or Formula II is administered to the subject animal or human, wherein it modifies the activity of farnesyl pyrophosphate synthase in the subject animal or human.

In some embodiments, the method includes administering an effective amount of a compound of Formula II or a pharmaceutically acceptable salt or hydrate thereof to a patient in need of such treatment. In some embodiments, the method includes administering an effective amount of a compound of Formula IIa, IIb, IIc, IId, or Ile or a pharmaceutically acceptable salt or hydrate thereof to a patient in need of such treatment. In some embodiments, the method includes administering an effective amount of a compound or a pharmaceutically acceptable salt or hydrate of a compound selected from:

In yet another aspect, a pharmaceutically acceptable salt or hydrate of a compound of Formula III is provided,

where R₁, R₂, R₃, R₄ and R₅ are each independently:

-   a) hydrogen; -   b) halogen, —CN, —CF₃, or —NO₂; -   c) C₁-C₈ alkyl or C₁-C₈ haloalkyl; -   d) C₂-C₈ alkenyl or C₂-C₈ haloalkenyl; -   e) C₂-C₈ alkynyl or C₂-C₈ haloalkynyl; -   f) optionally substituted aryl or optionally substituted heteroaryl; -   g) —C(O)R₆; -   h) —C(O)OR₆, or —CO₂R₆; -   i) —OR₆, —O-L-OC(O)R₆, or —O-L-OC(O)OR₆; -   j) —OC(O)R₆, or —OC(O)-L-OC(O)R₆; -   k) —OC(O)OR₆, —OC(O)O-L-C(O)R₇, —OC(O)O-L-C(O)OR₇, or -L-OC(O)R₆; -   l) —C(O)NR₆R₇, or —CNR₆R₇; -   m) —OC(O)NR₆R₇, —OC(O)N(R₆)-L-OC(O)R₇, —OC(O)O-L-(R₆)-L-C(O)R₇,     —OC(O)—C(R₆)(R₇)-L-OC(O)R₈, —OC(O)N(-L-OC(O)R₇)(-L-OC(O)R₈); -   n) —SR₆, or —NR₆R₇; -   o) —NR₆C(O)R₇; -   p) —NR₆C(O)OR₇; -   q) —NR₆C(O)NR₇; -   r) —OSO₂R₆; -   s) —SO₂OR₆; -   t) —SO₂R₆; -   u) —NR₆SO₂R₇; -   v) —SO₂NR₆R₇;

or

-   bb) R₁ and R₂, R₂ and R₃, R₃ and R₄, or R₄ and R₅ taken together     form an optionally substituted 4- to 8-membered carbocyclic or     heterocyclic ring, wherein the ring is saturated, unsaturated or     aromatic; -   wherein m and n are each independently an integer from 0 to 2; -   Y is —CH₂—, —O—, —NR₇—, or —S—; -   p is an integer from 1 to 3; -   R₁₄ is hydrogen, halogen, C₁-C₈ alkyl, or C₁-C₈ alkoxyl; -   Z is

-   R₆ is independently hydrogen, C₁-C₈ alkyl, C₁-C₈ haloalkyl, C₂-C₈     alkenyl, C₂-C₈ haloalkenyl, C₂-C₈ alkynyl, C₂-C₈ haloalkynyl, an     optionally substituted 4-8 membered saturated carbocyclic or     heterocyclic ring, optionally substituted aryl, optionally     substituted heteroaryl, -L-optionally substituted aryl or     -L-optionally substituted heteroaryl; -   R₇ and R₈ are each independently hydrogen or C₁-C₈ alkyl; and L is     C₁-C₈ alkyl; or -   R₆ and R₇ taken together form an optionally substituted 4- to     8-membered carbocyclic or heterocyclic ring, wherein the ring is     saturated, unsaturated or aromatic; and -   R₉ and R₁₀ are each independently hydrogen, halogen, oxygen, C₁-C₈     alkyl, C₁-C₈ haloalkyl, C₂-C₈ alkenyl, C₂-C₈ haloalkenyl, C₂-C₈     alkynyl, C₂-C₈ haloalkynyl, optionally substituted aryl, optionally     substituted heteroaryl, —OR₆, —SR₆, —NR₆R₇, —(C₁-C₈ alkyl)-NR₆R₇,     —(C₁-C₈ haloalkyl)-NR₆R₇, —(C₂-C₈ alkenyl)-NR₆R₇, —(C₂-C₈     haloalkenyl)-NR₆R₇, —(C₂-C₈ alkynyl)-NR₆R₇, —(C₂-C₈     haloalkyl)-NR₆R₇, -L-R₁₁; or -   R₉ and R₁₀ taken together form a monocyclic or bicyclic optionally     substituted carbocyclic or heterocyclic ring, wherein the ring is     saturated, unsaturated or aromatic; and -   R₁₁ is optionally substituted aryl or optionally substituted     heteroaryl.

In some embodiments, R₉ is hydrogen, oxygen, —F, —Cl, —CH₃, —OH, —SH, —NH₂, —CH₂—R₁₁, or —N—(C₁-C₈ alkyl); R₁₀ is —Cl, —CH₃, —S-phenyl, —S(p-chlorophenyl), —(CH₂)_(q)NH₂, —(CH₂)_(q)NR₆R₇,

q is an integer from 0 to 8; R₁ is an optionally substituted aryl group, wherein the substituent is chosen from a group consisting of —CF₃, —CN, and —F; R₁₂ is hydrogen, —OH, C₁-C₈ alkyl, —CH₃, or —F; R₁₃ is hydrogen, —OH, C₁-C₈ alkyl, —OCH₃, —OCH₂-phenyl, —CF₃, —NH₂, —F, or —Br;

R₁₈ and R₁₉ are each independently hydrogen, halogen, —N(R_(y))₂, —SR_(y), an optionally substituted alkyl group, an optionally substituted alkenyl group, an optionally substituted alkoxyl group, and an optionally substituted aryl group, where R_(y) is selected from hydrogen, an optionally substituted alkyl group and an optionally substituted aryl group; or R₁₈ and R₁₉ taken together form an optionally substituted carbocyclic or heterocyclic ring, wherein the ring is saturated, unsaturated or aromatic; and

R₂₀-R₂₄ are each independently hydrogen, halogen, —CN, —OR_(z), —COOR_(z), —OCOOR_(z), —COR_(z), —CON(R_(z))₂, —OCON(R_(z))₂, —N(R_(z))₂, —NO₂, —SR_(z), —SO₂R, —SO₂N(R_(z))₂ or —SOR_(z) group, an optionally substituted alkyl group, an optionally substituted alkenyl group, and an optionally substituted aryl group, where R_(z) is selected from hydrogen, an optionally substituted alkyl group, an optionally substituted aryl group, and an optionally substituted acyl group; or

R₂₀ and R₂₁, R₂₁ and R₂₂, R₂₂ and R₂₃, or R₂₃ and R₂₄ when taken together form one or more optionally substituted carbocyclic or heterocyclic rings, wherein the ring is saturated, unsaturated or aromatic; and

either R₂₅ or R₂₆ is hydrogen and the other is an alkyl group substituted with a substituted or unsubstituted aryl group.

In certain specific embodiments, R₁₀ is —CH₂CH₂NH₂, —(CH₂)₃NH₂, —(CH₂)₂N(CH₃)((CH₂)₄CH₃),

In certain other embodiments, R₉ is —OH.

In some embodiments, R₉ is hydrogen, —F, or —Cl; R₁₀ is

R₁₂ is hydrogen, —OH, C₁-C₈ alkyl, —OCH₃, or —F; and R₁₃ is hydrogen, —OH, C₁-C₈ alkyl, or —F. In certain specific embodiments, R₉ is hydrogen or —F; and R₁₂ and R₁₃ are each independently hydrogen, —OH, —CH₃, —CH₂CH₃, —C(CH₃)₃, or —F. In certain other embodiments, R₉ is hydrogen or —F; and R₁₂ and R₁₃ are each hydrogen.

In some embodiments, R₉ and R₁₀ are taken together to form one of the following bicyclic rings:

In some embodiments, R₁ and R₅ are each independently halogen; and

R₃ is —OR₆, —O-L-OC(O)R₆, —O-L-OC(O)OR₆, —OC(O)R₆, —OC(O)-L-OC(O)R₆, —OC(O)OR₆, —OC(O)O-L-C(O)R₇, —OC(O)NR₆R₇, —OC(O)N(R₆)-L-OC(O)R₇, —OC(O)N(-L-OC(O)R₇)(-L-OC(O)R₈),

the remaining R-groups of R₁, R₂, R₃, R₄, and R₅ are each hydrogen; and R₆, R₇, R₈, L, Z, Y, m, n, and p are as defined above.

In some embodiments, R₁ is —OR₆, —O-L-OC(O)R₆, —O-L-OC(O)OR₆, —OC(O)R₆,

-   —OC(O)-L-OC(O)R₆, —OC(O)OR₆, —OC(O)O-L-C(O)R₇, —OC(O)NR₆R₇,     —OC(O)N(R₆)-L -   —OC(O)R₇, —OC(O)N(-L-OC(O)R₇)(-L-OC(O)R₈),

one of the remaining R-groups of R₁, R₂, R₃, R₄, and R₅ is halogen, —CF₃, C₁-C₈ alkyl, phenyl, —OR₆, or —C(O)OR₆; each remaining R-group of R₁, R₂, R₃, R₄, and R₅ is hydrogen; and R₆, R₇, R₈, L, Z, Y, m, n, and p are as defined above.

In some embodiments, R₃ is —OR₆, —O-L-OC(O)R₆, —O-L-OC(O)OR₆, —OC(O)R₆,

-   —OC(O)-L-OC(O)R₆, —OC(O)OR₆, —OC(O)O-L-C(O)R₇, —OC(O)NR₆R₇,     —OC(O)N(R₆)-L -   —OC(O)R₇, —OC(O)N(-L-OC(O)R₇)(-L-OC(O)R₈),

one of the remaining R-groups of R₁, R₂, R₃, R₄, and R₅ is halogen, —CF₃, C₁-C₈ alkyl, phenyl, —OR₆, or —C(O)OR₆; each remaining R-group of R₁, R₂, R₃, R₄, and R₅ is hydrogen; and R₆, R₇, R₈, L, Z, Y, m, n, and p are as defined above.

In some embodiments, R₁ is —OR₆, —O-L-OC(O)R₆, —O-L-OC(O)OR₆, —OC(O)R₆, —OC(O)-L-OC(O)R₆, —OC(O)OR₆, —OC(O)O-L-C(O)R₇, —OC(O)NR₆R₇,

-   —OC(O)N(R₆)-L-OC(O)R₇, —OC(O)N(-L-OC(O)R₇)(-L-OC(O)R₈),

R₂, R₃, R₄, and R₅ are each hydrogen; and R₆, R₇, R₈, L, Z, Y, m, n, and p are as defined above.

In some embodiments, R₃ is —OR₆, —O-L-OC(O)R₆, —O-L-OC(O)OR₆, —OC(O)R₆, —OC(O)-L-OC(O)R₆, —OC(O)OR₆, —OC(O)O-L-C(O)R₇, —OC(O)NR₆R₇, —OC(O)N(R₆)-L-OC(O)R₇, —OC(O)N(-L-OC(O)R₇)(-L-OC(O)R₈),

R₁, R₂, R₄, and R₅ are each hydrogen; and R₆, R₇, R₈, L, Z, Y, m, n, and p are as defined above.

In some embodiments, R₁₀ is —CH₂CH₂NH₂, —(CH₂)₃NH₂, —(CH₂)₂N(CH₃)((CH₂)₄CH₃),

In some embodiments, R₁ is —OC(O)OCH₃, —OC(O)OCH₂CH₃ or —OC(O)OCH(CH₃)₂; R₂, R₃, R₄ and R₅ are each independently hydrogen, halogen, —CF₃, C₁-C₈ alkyl, optionally substituted phenyl, —OR₆, or —C(O)OR₆; R₉ is hydrogen, —F, —OH, or —Cl; R₁₀ is —CH₃, —Cl, —(CH₂)_(q)NH₂, —(CH₂)₂NR₆R₇, —S(p-chlorophenyl),

wherein R₁₂ is hydrogen, —OH, C₁-C₈ alkyl, —OCH₃, or —F; and R₁₃ is hydrogen, —OH, C₁-C₈ alkyl, or —F. In certain specific embodiments, R₉ is hydrogen, —OH, or —F; and R₁₂ and R₁₃ are each independently hydrogen, —OH, —CH₃, —CH₂CH₃, —C(CH₃)₃, or —F. In certain other embodiments, R₉ is hydrogen or —F; and R₁₂ and R₁₃ are each hydrogen. In preferred embodiments, R₂, R₃, R₄ and R₅ are each independently hydrogen, halogen, or —CF₃, and in more preferred embodiments, R₂, R₃, R₄ and R₅ are each hydrogen. In preferred embodiments, R₂, R₃, R₄, R₅, R₁₂ and R₁₃ are each hydrogen.

In yet another aspect, a compound or a pharmaceutically acceptable salt or hydrate of a compound of Formula IV is provided,

wherein A is —OR₆, —CO₂R₆, -L-OC(O)R₆, —O-L-OC(O)R₆, —O-L-OC(O)OR₆, —OC(O)R₆, —OC(O)-L-OC(O)R₆, —OC(O)OR₆, —OC(O)O-L-C(O)R₇, —OC(O)O-L-C(O)OR₇, —C(O)NR₆R₇, —CNR₆R₇, —OC(O)NR₆R₇, —OC(O)N(R₆)-L-OC(O)R₇, —OC(O)N(-L-OC(O)R₇)(-L-OC(O)R₈),

and B and C are each independently hydrogen, halogen, —CF₃, —CN, C₁-C₈ alkyl, phenyl, —OR₆, or —C(O)OR₆, or B and C when taken together form an optionally substituted 4- to 8-membered carbocyclic or heterocyclic ring, wherein the ring is saturated, unsaturated or aromatic; and R₉ and R₁₀ are each independently hydrogen, halogen, oxygen, C₁-C₈ alkyl, C₁-C₈ haloalkyl, C₂-C₈ alkenyl, C₂-C₈ haloalkenyl, C₂-C₈ alkynyl, C₂-C₈ haloalkynyl, optionally substituted aryl, optionally substituted heteroaryl, —OR₆, —SR₆, —NR₆R₇, —(C₁-C₈ alkyl)-NR₆R₇, —(C₁-C₈ haloalkyl)-NR₆R₇,

-   —(C₂-C₈ alkenyl)-NR₆R₇, —(C₂-C₈ haloalkenyl)-NR₆R₇, —(C₂-C₈     alkynyl)-NR₆R₇, —(C₂-C₈ haloalkyl)-NR₆R₇, -L-R₁₁; or R₉ and R₁₀     taken together form a monocyclic or bicyclic optionally substituted     carbocyclic or heterocyclic ring, wherein the ring is saturated,     unsaturated or aromatic; and R₁₁ is optionally substituted aryl or     optionally substituted heteroaryl; m and n are each independently an     integer from 0 to 2; Y is —CH₂—, —O—, —NR₇—, or —S—; p is an integer     from 1 to 3; Z is N or CH; -   each R₆ is independently hydrogen, C₁-C₈ alkyl, C₁-C₈ haloalkyl,     C₂-C₈ alkenyl, C₂-C₈ haloalkenyl, C₂-C₈ alkynyl, C₂-C₈ haloalkynyl,     an optionally substituted 4-8 membered saturated carbocyclic or     heterocyclic ring, optionally substituted aryl, optionally     substituted heteroaryl, -L-optionally substituted aryl or     -L-optionally substituted heteroaryl; -   L is C₁-C₈ alkyl; R₁₄ is hydrogen, halogen, C₁-C₈ alkyl, or C₁-C₈     alkoxyl; -   R₇ and R₈ are each independently hydrogen or C₁-C₈ alkyl; -   or R₆ and R₇ taken together form an optionally substituted 4- to     8-membered carbocyclic or heterocyclic ring, wherein the ring is     saturated, unsaturated or aromatic.

In some embodiments, R₉ is hydrogen, oxygen, —F, —Cl, —CH₃, —OH, —SH, —NH₂, —CH₂—R₁₁, or —N—(C₁-C₈ alkyl); R₁₀ is —Cl, —CH₃, —S-phenyl, —S(p-chlorophenyl), —(CH₂)_(q)NH₂, —(CH₂)_(q)NR₆R₇,

q is an integer from 0 to 8; R₁₁ is an optionally substituted aryl group, wherein the substituent is chosen from a group consisting of —CF₃, —CN, and —F; R₁₂ is hydrogen, —OH, C₁-C₈ alkyl, —CH₃, or —F; R₁₃ is hydrogen, —OH, C₁-C₈ alkyl, —OCH₃, —OCH₂-phenyl, —CF₃, —NH₂, —F, or —Br;

-   R₁₈ and R₁₉ are each independently hydrogen, halogen, —N(R_(y))₂,     —SR_(y), an optionally substituted alkyl group, an optionally     substituted alkenyl group, an optionally substituted alkoxyl group,     and an optionally substituted aryl group, where R_(y) is selected     from hydrogen, an optionally substituted alkyl group and an     optionally substituted aryl group; or R₁₈ and R₁₉ taken together     form an optionally substituted carbocyclic or heterocyclic ring,     wherein the ring is saturated, unsaturated or aromatic; and -   R₂₀-R₂₄ are each independently hydrogen, halogen, —CN, —OR_(z),     —COOR_(z), —OCOOR_(z), —COR_(z), —CON(R_(z))₂, —OCON(R_(z))₂,     —N(R_(z))₂, —NO₂, —SR_(z), —SO₂R, —SO₂N(R_(z))₂ or —SOR_(z), group,     an optionally substituted alkyl group, an optionally substituted     alkenyl group, and an optionally substituted aryl group, where R_(z)     is selected from hydrogen, an optionally substituted alkyl group, an     optionally substituted aryl group, and an optionally substituted     acyl group; or -   R₂₀ and R₂₁, R₂₁ and R₂₂, R₂₂ and R₂₃, or R₂₃ and R₂₄ when taken     together form one or more optionally substituted carbocyclic or     heterocyclic rings, wherein the ring is saturated, unsaturated or     aromatic; and -   either R₂₅ or R₂₆ is hydrogen and the other is an alkyl group     substituted with a substituted or unsubstituted aryl group. -   In certain specific embodiments, R₁₀ is —CH₂CH₂NH₂, —(CH₂)₃NH₂,     —(CH₂)₂N(CH₃)((CH₂)₄CH₃),

In certain other embodiments, R₉ is —OH.

In some embodiments, A is in the ortho or para position relative to C. In other embodiments, A is in the meta position relative to C.

In some embodiments, the compound is a compound or a pharmaceutically acceptable salt or hydrate of a compound of Formula IVa, IVb, IVc, IVd, or IVe:

In some embodiments, the compound is a compound or a pharmaceutically acceptable salt or hydrate of a compound of Formula IVf, wherein R₉ is H, OH or F; R₁₀ is

R_(x) is C₁-C₈ alkyl, C₁-C₈ alkoxyl, or

and R₇, R₈, and n are as defined above.

In some embodiments, specific examples of compounds or pharmaceutically acceptable salts or hydrates of the compounds of Formula III and Formula IV, and, specifically of Formula IVf, include, without limitation:

In some embodiments, specific examples of compounds or pharmaceutically acceptable salts or hydrates of the compounds of Formula III and Formula IV include, without limitation:

In some embodiments, a pharmaceutical composition including a compound or a pharmaceutically acceptable salt or hydrate of a compound of Formula III or IV and a pharmaceutically acceptable carrier is provided. Preferably, the compound of Formula III or Formula IV is selected from one of the specific embodiments disclosed above, and, more preferably, the compound is selected from the examples of compounds listed above.

In some embodiments, the pharmaceutical composition further comprises at least one pharmaceutically active ingredient selected from the group consisting of: an anti-inflammatory, an immunomodulator, a chelator, a musculoskeletal anabolic agent, and a combination thereof.

In yet another aspect, a method of treating or preventing disorders associated with abnormal calcium and phosphate metabolism is disclosed, including administering an effective amount of a compound or a pharmaceutically acceptable salt or hydrate of a compound of Formula III, IV, IVa, IVb, IVc, IVd, IVe or IVf to a patient in need of such treatment. Preferably, the compound of Formula III, IV, IVa, IVb, IVc, IVd, IVe or IVf is selected from one of the of the specific embodiments disclosed above, and, more preferably, the compound is selected from the examples of compounds listed above.

In certain specific embodiments of the method of treating or preventing disorders associated with abnormal calcium and phosphate metabolism, the disorder associated with abnormal calcium and phosphate metabolism is osteoporosis, rheumatoid arthritis, osteoarthritis, Paget's disease, alveolar bone loss, bone related cancer therapy, or an orthopedic disorder. In other embodiments, the disorder is a non-skeletal disorder selected from the group consisting of; a non-bone cancer, an inflammatory disorder, an immunomodulatory disorder, and a parasitic disorder. In some embodiments, the parasitic disorder is selected from the group consisting of malaria, leishmaniasis, a trypanasomal disease, an entamoebal infection, a giardia infection, and a cryptosporidial infection.

In some embodiments, the compound or a pharmaceutically acceptable salt or hydrate of a compound of Formula III, IV, IVa, IVb, IVc, IVd, IVe or IVf administered to the subject animal or human modifies the activity of farnesyl pyrophosphate synthase in the subject animal or human.

In some embodiments, the method includes administering an effective amount of a compound of Formula III or a pharmaceutically acceptable salt or hydrate thereof to a patient in need of such treatment, where R₉ is hydrogen, —F, or —Cl;

-   R₁₀ is

-   R₁₂ is hydrogen, —OH, C₁-C₈ alkyl, —OCH₃, or —F; and R₁₃ is     hydrogen, —OH, C₁-C₈ alkyl, or —F. In some embodiments, the method     includes administering an effective amount of a compound or a     pharmaceutically acceptable salt or hydrate of a compound of Formula     III to a patient in need of such treatment, where R₁ and R₅ are each     independently halogen; and R₃ is —OR₆, —O-L-OC(O)R₆, —O-L-OC(O)OR₆,     —OC(O)R₆, —OC(O)-L-OC(O)R₆, —OC(O)OR₆, —OC(O)O-L-C(O)R₇,     —OC(O)NR₆R₇, —OC(O)N(R₆)-L-OC(O)R₇, —OC(O)N(-L-OC(O)R₇)(-L-OC(O)R₈),

the R₂ and R₄ are each hydrogen; and R₆, R₇, R₈, L, m and n are as defined above.

-   In some embodiments, R₁ is —OR₆, —O-L-OC(O)R₆, —O-L-OC(O)OR₆,     —OC(O)R₆, —OC(O)-L-OC(O)R₆, —OC(O)OR₆, —OC(O)O-L-C(O)R₇,     —OC(O)NR₆R₇, —OC(O)N(R₆)-L-OC(O)R₇, —OC(O)N(-L-OC(O)R₇)(-L-OC(O)R₈),

one of R₂, R₃, R₄ and R₅ is halogen, —CF₃, C₁-C₈ alkyl, phenyl, —OR₆, or —C(O)OR₆; each remaining R-group of R₁, R₂, R₃, R₄, and R₅ is hydrogen; and R₆, R₇, R₈, L, m and n are as defined above.

In some embodiments, R₃ is —OR₆, —O-L-OC(O)R₆, —O-L-OC(O)OR₆, OC(O)R₆, —OC(O)-L-OC(O)R₆, —OC(O)OR₆, —OC(O)O-L-C(O)R₇, —OC(O)NR₆R₇, —OC(O)N(R₆)-L-OC(O)R₇, —OC(O)N(-L-OC(O)R₇)(-L-OC(O)R₈),

one of R₁, R₂, R₄ and R₅ is halogen, —CF₃, C₁-C₈ alkyl, phenyl, —OR₆, or —C(O)OR₆; each remaining R-group of R₁, R₂, R₄ and R₅ is hydrogen; and R₆, R₇, R₈, L, m and n are as defined above.

In some embodiments, R₁ is —OR₆, —O-L-OC(O)R₆, —O-L-OC(O)OR₆, —OC(O)R₆, —OC(O)-L-OC(O)R₆, —OC(O)OR₆, —OC(O)O-L-C(O)R₇, —OC(O)NR₆R₇, —OC(O)N(R₆)-L-OC(O)R₇, —OC(O)N(-L-OC(O)R₇)(-L-OC(O)R₈),

R₂, R₃, R₄, and R₅ are each hydrogen; and R₆, R₇, R₈, L, m and n are as defined above. In some embodiments, the method includes administering an effective amount of a compound or a pharmaceutically acceptable salt or hydrate of a compound of Formula III to a patient in need of such treatment, where R₃ is —OR₆, —O-L-OC(O)R₆, —O-L-OC(O)OR₆, —OC(O)R₆, —OC(O)-L-OC(O)R₆, —OC(O)OR₆, OC(O)O-L-C(O)R₇, —OC(O)NR₆R₇, —OC(O)N(R₆)-L-OC(O)R₇, —OC(O)N(-L-OC(O)R₇)(-L-OC(O)R₈),

R₁, R₂, R₄, and R₅ are each hydrogen; and R₆, R₇, R₈, L, m and n are as defined above. In some embodiments, the method includes administering an effective amount of a compound or a pharmaceutically acceptable salt or hydrate of a compound of Formula IV to a patient in need of such treatment. In some embodiments, the method includes administering an effective amount of a compound or a pharmaceutically acceptable salt or hydrate of a compound of Formula IV, IVa, IVb, IVc, IVd, IVe or IVf to a patient in need of such treatment.

In some embodiments, a method of treating or preventing disorders associated with abnormal calcium and phosphate metabolism is disclosed. The method includes administering an effective amount of a compound or a pharmaceutically acceptable salt or hydrate of a compound of Formula IV, and the compound is selected from:

Summary of Properties

The bisphosphonate cyclic acetal compounds described herein demonstrate improved absorption, especially under oral administration, compared with the tetra acid bisphosphonates. During oral administration, a very low percentage, e.g., from about 0.2% to about 5%, of the dosed bisphosphonates is absorbed. Due to the polar nature of the molecule, bisphosphonates generally have low affinity to lipids, thus making it difficult for them to cross the cell membranes. In addition, paracellular transportation is difficult because bisphosphonates are polar and can easily become charged under physiological conditions. In comparison, bisphosphonate cyclic acetal compounds disclosed herein utilize a bisphosphonate cyclic acetal to “mask” a portion of the bisphosphonic acid functionality. Thus, the lipophilicity of the resulting bisphosphonate cyclic acetal compounds is greatly increased, which facilitates their transportation through the lipid-containing membrane and results in improved absorption. In some embodiments, the bisphosphonate cyclic acetal compounds described herein result in up to five times better absorption than the tetra acid bisphosphonates.

The bisphosphonate cyclic acetal compounds described herein also exhibit improved absorption in the presence of food when compared with the tetra acid bisphosphonates. During oral administration in the presence of food, especially with food rich in calcium, the absorption of the tetra acid bisphosphonates is further dramatically reduced, because bisphosphonates form stable and insoluble chelates with calcium in food, resulting in very low or virtually no absorption. Because of this food effect, most bisphosphonates have a food restriction during oral administration. The bisphosphonate cyclic acetal compounds contain a six-membered bisphosphonate cyclic acetal ring. The bisphosphonate cyclic acetal masks one hydroxyl group from each phosphonate constraining them in a six-membered ring conformation, thereby hindering (and in some cases preventing) any bisphosphonate-calcium chelation. In some embodiments, the bisphosphonate cyclic acetal compounds are stable in the gastrointestinal tract. As a result, the bisphosphonate cyclic acetal compounds described herein exhibit improved absorption when administered with food.

Once absorbed, the bisphosphonate cyclic acetal compounds described herein are converted to the tetra acid bisphosphonates. During this conversion, the cyclic acetal moiety of the bisphosphonate cyclic acetal compounds is cleaved under in vivo conditions and the tetra acid bisphosphonates are released while generating certain byproducts of the cyclic acetal moiety. In some embodiments, the byproducts generated are those a generally recognized as GRAS, a status designated for substances considered safe in foods. In some embodiments, the byproduct generated is salicyclic acid or salicyclic aldehyde, both of which are generally recognized as safe (GRAS). In some embodiments, the process of the conversion utilizes enzymes. Exemplary enzymes include, but are not limited to, hydrolases. An exemplary mechanism, without limitation, of the conversion from the bisphosphonate cyclic acetal to the tetra acid bisphosphonate is shown in Scheme 1. In Scheme 1, bisphosphonate cyclic acetal 1 is used to demonstrate a proposed mechanism of the conversion, where R₉ and R₁₀ are as defined herein and non-limiting examples of R′ include R₆, and as defined herein. The R′C(O) moiety is cleaved by certain enzymes, e.g., a hydrolase, to provide intermediate 2, which undergoes spontaneous disintegration to release the tetra acid bisphosphonate 3, while generating salicyclic byproduct 4 (R″ is H or OH). Ideally, this conversion occurs after the absorption of the bisphosphonate cyclic acetal compounds, thus resulting in the release of the bisphosphonate after absorption.

Thus, the bisphosphonate cyclic acetal compounds described herein demonstrate improved lipophilicity and oral administration absorption, especially when administered with food. The cyclic acetal compounds are converted to the tetra acid bisphosphonates after absorption, thus resulting in an increase exposure of bisphosphonate. Other potential advantages of the bisphosphonate cyclic acetal compounds include fewer esophagus side effects and fewer administration restrictions. In some embodiments, the bisphosphonate cyclic acetal compounds described herein demonstrates improved safety or tolerability during IV administration.

Synthesis

The compounds and their pharmaceutically acceptable salts or hydrates described herein are prepared using a variety of methods starting from commercially available compounds, known compounds, or compounds prepared by known methods. General synthetic routes to many of the compounds described herein are included in the following schemes. It is understood by those skilled in the art that protection and deprotection steps not shown in the Schemes may be required for these syntheses, and that the order of steps may be changed to accommodate functionality in the target molecule. The need for protection and deprotection, and the selection of appropriate protecting groups are found, for example, in Greene and Wuts, Protecting Groups in Organic Synthesis, Second Edition, John Wiley & Sons (1991), which is incorporated herein by reference in its entirety.

In the schemes described herein, appropriate solvents include, but are not limited to, dimethyl sulfoxide, dimethylformamide, tetrahydrofuran, methanol, ethanol, methylene chloride, toluene, and acetone. Suitable acid binding agents include, but are not limited to, organic bases, such as, for example, pyridine, triethylamine, triethanolamine, 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), and diisopropylethylamine (DIPEA); and inorganic bases, such as, for example, sodium hydride, potassium carbonate, and sodium carbonates. Suitable reducing agents include, but are not limited to, sodium cyanoborohydride and sodium triacetoxyborohydride.

Firstly, substituted benzylaldehydes are provided. In some embodiments, the substituted benzylaldehydes are commercially available. In other embodiments, the substituted benzylaldehydes are prepared by methods known in the art, as illustrated in the following schemes.

In some embodiments, benzylaldehydes bearing an ether linkage are synthesized. Scheme 2 illustrates one process for making substituted benzaldehyde 6 bearing an ether linkage, where R_(a) is any of R₁, R₂, R₃, R₄, and R₅, which are as defined herein. r is an integer from 0 to 4. The hydroxyl group is ortho, meta, or para with respect to the aldehyde group. LG is a leaving group and R_(b) is an optionally substituted alkyl group. Non-limiting examples of R_(b) include —R₆, -L-OC(O)R₆, and -L-OC(O)OR₆, where R₆ and L are as defined herein. Exemplary leaving groups include, without limitation, Cl, Br, I, OTf (OSO₂CF₃), and OTs (OSO₂C₆H₄CH₃). As shown in Scheme 2, substituted hydroxybenzaldehyde 5 is reacted with R_(b)-LG under conditions effective to produce substituted hydroxybenzaldehyde 6, where OR_(b) occupies a position on the phenyl ring which is ortho, meta, or para relative to the aldehyde group. The reaction is carried out in an appropriate solvent, e.g., acetone, acetonitrile, dimethylformide, or a mixture thereof. An acid binding agent is used in this reaction. Exemplary appropriate acid binding agents include, without limitation, inorganic bases, such as, for example, sodium hydride, potassium carbonate, and sodium carbonates and organic bases, such as, for example, pyridine, triethylamine, triethanolamine, 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), and diisopropylethylamine (DIPEA). This reaction is carried out at low temperature, e.g., 0° C., at room temperature, under heating conditions, or a combination thereof.

In other embodiments, benzylaldehydes bearing an ester linkage are synthesized. Scheme 3 illustrates one process for making substituted benzaldehyde 7 bearing an ester linkage, where R_(a) and r are as defined herein and R_(c) is an optionally substituted alkyl group. Non-limiting examples of R_(c) include —R₆ and -L-OC(O)R₆, where R₆ and L are as defined herein. The hydroxyl group is ortho, meta, or para with respect to the aldehyde group. As shown in Scheme 3, substituted hydroxybenzaldehyde 5 is reacted under conditions effective to produce substituted hydroxybenzaldehyde 7, where —OC(O)R_(c) occupies a position on the phenyl ring which is ortho, meta, or para relative to the aldehyde group. An acylating agent is used in this process. Exemplary acylating agents include, without limitation, R_(c)C(O)OH, R_(c)C(O)Cl, and (R_(c)C(O))₂O. When R_(c)C(O)OH is used as the acylating agent, coupling agents are used to promote the esterification reaction. Exemplary coupling agents include, without limitation, DCC (Dicyclohexylcarbodiimide), DIC (N,N′-Diisopropylcarbodiimide), and EDC (1-Ethyl-3-(3-dimethylaminopropyl)carbodiimide). When (R_(c)C(O))₂O is used as the acylating agent, a catalyst is used to promote the esterification reaction. Exemplary catalysts include, without limitation, DMAP (4-Dimethylaminopyridine). The reaction is carried out in an appropriate solvent, e.g., methylene chloride, toluene, dimethylformide, or a mixture thereof. An acid binding agent is used in this reaction. Appropriate acid binding agents include, without limitation, organic bases, such as, for example, pyridine, triethylamine, triethanolamine, 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), and diisopropylethylamine (DIPEA). This reaction is carried out at low temperature, e.g., 0° C., at room temperature, under heating conditions, or a combination thereof.

In yet other embodiments, benzylaldehydes bearing a carbonate linkage are synthesized. Scheme 4 illustrates one process for making substituted benzaldehyde 8 bearing a carbonate linkage, where R_(a) and r are defined herein and R_(d) is an optionally substituted alkyl group. Non-limiting examples of R_(d) include —R₆, and -L-OC(O)R₇, where R₆, R₇ and L are defined herein. The hydroxyl group is ortho, meta, or para with respect to the aldehyde group. As shown in Scheme 4, substituted hydroxybenzaldehyde 5 is reacted under conditions effective to produce substituted hydroxybenzaldehyde 8, where —OC(O)OR_(d) can occupy a position on the phenyl ring which is ortho, meta, or para relative to the aldehyde group. A derivatizing reagent is used in this process. Exemplary derivatizing reagents include, without limitation, R_(d)OC(O)Cl. The derivatizing reagent R_(d)C(O)Cl is commercially available or is produced by methods known in the art. The reaction is carried out in an appropriate solvent, e.g., methylene chloride, toluene, dimethylformide, or a mixture thereof. An acid binding agent is used in this reaction. Exemplary appropriate acid binding agents include, without limitation, organic bases, such as, for example, pyridine, triethylamine, triethanolamine, 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), and diisopropylethylamine (DIPEA). This reaction is carried out at low temperature, e.g., 0° C., at room temperature, under heating conditions, or a combination thereof

In yet other embodiments, benzylaldehydes bearing a carbamate linkage are synthesized. Scheme 5 illustrates one process for making substituted benzaldehyde 9 bearing a carbamate linkage, where R_(a) and r are defined herein and R_(e) is an optionally substituted amino group. Non-limiting examples of R_(e) include —NR₆R₇, —N(R₆)-L-OC(O)R₇, —N(-L-OC(O)R₇)(-L-OC(O)R₈),

where R₆, R₇, R₈, L, m, and n are defined herein. The hydroxyl group is ortho, meta, or para with respect to the aldehyde group. As shown in Scheme 5, substituted hydroxybenzaldehyde 5 is reacted under conditions effective to produce substituted hydroxybenzaldehyde 9, where —OC(O)R_(e) occupies a position on the phenyl ring which is ortho, meta, or para relative to the aldehyde group. A derivatizing reagent is used in this process. Exemplary derivatizing reagents include, without limitation, R_(e)C(O)Cl. The derivatizing reagent R_(e)C(O)Cl is commercially available or is produced by methods known in the art. The reaction is carried out in an appropriate solvent, e.g., methylene chloride, toluene, dimethylformide, or a mixture thereof. An acid binding agent is used in this reaction. Exemplary appropriate acid binding agents include, without limitation, pyridine, triethylamine, triethanolamine, 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), diisopropylethylamine (DIPEA), and sodium hydride. This reaction is carried out at low temperature, e.g., 0° C., at room temperature, under heating conditions, or a combination thereof.

Secondly, as shown in Scheme 6, bisphosphonate cyclic acetal compounds are synthesized from substituted benzaldehyde 10. Substituted benzaldehyde 10 is any commercially available benzaldehyde or any benzaldehyde synthesized by methods known in the art, e.g., benzaldehydes 6-9 as shown in Schemes 2-5. In Scheme 6, R₁, R₂, R₃, R₄, R₅, R₉ and R₁₀ are defined herein, X and Y are halogens including, without limitation, Cl, Br, and I, and R_(f) is C₁-C₈ alkyl, C₂-C₈ alkenyl, or C₂-C₈ alkynyl. As illustrated in Scheme 6, substituted benzaldehyde 10 is converted to intermediate 11. In some embodiments, X and Y are both Cl and benzaldehyde 10 is reacted with reagent such as triphosgene under conditions effective to produce intermediate 11. Other exemplary reagents to convert benzaldehyde 10 to intermediate 11 (where X and Y are each Cl) include, without limitation, phosgene. The reaction is carried out in an appropriate solvent, e.g., tetrahydrofuran, toluene, or a mixture thereof. An acid binding agent is used in this reaction. Exemplary appropriate acid binding agents include, without limitation, pyridine, triethylamine, triethanolamine, 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), and diisopropylethylamine (DIPEA). This reaction is carried out at low temperature, e.g., 0° C., at room temperature, under heating conditions, or a combination thereof.

Intermediate 11 is then reacted with R_(f)OH under conditions effective to produce carbonate 12. In some embodiments, R_(f) is C₁-C₈ alkyl and X and Y are each Cl and intermediate 11 is reacted with t-BuOH to produce carbonate 12. This reaction is carried out in an appropriate solvent, e.g., tetrahydrofuran, methylene chloride, toluene, or a mixture thereof. An acid binding agent is used in this reaction. Exemplary appropriate acid binding agents include, without limitation, pyridine, triethylamine, triethanolamine, 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), and diisopropylethylamine (DIPEA). This reaction is carried out at low temperature, e.g., 0° C., at room temperature, under heating conditions, or a combination thereof.

Carbonate 12 is then reacted with bisphosphonate 13 under conditions effective to produce bisphosphonate cyclic acetal 14. The reaction is carried out in an appropriate solvent, e.g., acetonitrile. An acid binding agent is used in this reaction. Appropriate acid binding agents include, without limitation, pyridine, triethylamine, triethanolamine, 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), and diisopropylethylamine (DIPEA). This reaction is carried out under inert atmosphere. Exemplary inert atmospheres include, without limitation, nitrogen and argon atmosphere. This reaction is carried out at room temperature, under heating conditions, or a combination thereof. In some embodiments, the produced bisphosphonate cyclic acetal 14 is purified by purification methods known in the art, e.g., silica gel column chromatography. In some embodiments, carbonate 12 where R_(f) is tert-butyl and X is Cl is reacted with bisphosphonate 13 to produce bisphosphonate cyclic acetal 14.

In some embodiments, bisphosphonate 13 where R₉ is OH and R₁₀ is

i.e., risedronate, is reacted with carbonate 12 under conditions effective to produce risedronate cyclic acetal 14, where R₉ is OH and R₁₀ is

In some embodiments, a mixture of risedronate (bisphosphonate 13 where R₉ is OH and R₁₀ is

diisopropylethylamine, and acetonitrile is heated at 40° C. for 1 hour and then cooled to room temperature. Carbonate 12 where R_(f) is tert-butyl and X is Cl is then added to the mixture and the mixture is heated at 35° C. for 16 hours under nitrogen atmosphere to produce risedronate cyclic acetal, (cyclic acetal 14 where R₉ is OH and R₁₀ is

In some embodiments, bisphosphonate 13 where R₉ is OH and R₁₀ is

is reacted with carbonate 12 under conditions effective to produce risedronate cyclic acetal 14, where R₉ is OH and R₁₀ is

In some embodiments, a mixture of risedronate (bisphosphonate 13 where R₉ is OH and R₁₀ is

diisopropylethylamine, and acetonitrile is heated at 40° C. for 1 hour and then cooled to room temperature. Carbonate 12 where R_(f) is tert-butyl and X is Cl is then added to the mixture and the mixture is heated at 35° C. for 16 hours under nitrogen atmosphere to produce risedronate cyclic acetal, (cyclic acetal 14 where R₉ is OH and R₁₀ is

In some embodiments, bisphosphonate 13 where R₉ is H and R₁₀ is

is reacted with carbonate 12 under conditions effective to produce risedronate cyclic acetal 14, where R₉ is H and R₁₀ is

In some embodiments, a mixture of risedronate (bisphosphonate 13 where R₉ is H and R₁₀ is

diisopropylethylamine, and acetonitrile is heated at 40° C. for 1 hour and then cooled to room temperature. Carbonate 12 where R_(f) is tert-butyl and X is Cl is then added to the mixture and the mixture is heated at 35° C. for 16 hours under nitrogen atmosphere to produce risedronate cyclic acetal, (cyclic acetal 14 where R₉ is H and R₁₀ is

The compounds and pharmaceutically acceptable salts or hydrates of the compounds described herein are also useful in the manufacture of medicaments for treating or preventing disorder associated with abnormal calcium and phosphate metabolism in a mammal.

The cyclic acetal bisphosphonate compounds may exist in two isomeric forms, i.e., cis-isomer and trans-isomer. As shown in Scheme 7, when the α-hydroxy group and the substituted phenyl group are on the opposite side of the six-membered cyclic acetal ring, the isomer is assigned as a trans-isomer. If the α-hydroxy group and the substituted phenyl group are on the same side of the six-membered cyclic acetal ring, the isomer is assigned as a cis-isomer. In some embodiments, the two isomers are separated and the configuration of each isomer is assigned using analogy to the NMR characteristics of reported similar systems (see (1). V. A. Pavlov, J. A. S. Smith, T. A. Zjablikova, Magnetic Resonance in Chemistry, 1992, 30, 716-722; (2) G. C. Levy, G. L. Nelson, Carbon-13 Nuclear Magnetic Resonance for Organic Chemists, Wiley-Interscience, New York, 1972).

Pharmaceutical Compositions

In some embodiments, the compounds or pharmaceutically acceptable salts or hydrates of the compounds described herein are a component of a composition that includes one or more pharmaceutically acceptable excipients.

In some embodiments, the composition further comprises a pharmaceutically-acceptable excipient. The term “pharmaceutically-acceptable excipient,” as used herein, means any physiologically inert, pharmacologically inactive material known to one skilled in the art, which is compatible with the physical and chemical characteristics of the isomer herein. Pharmaceutically-acceptable excipients include, but are not limited to, polymers, resins, plasticizers, fillers, lubricants, diluents, binders, disintegrants, solvents, co-solvents, surfactants, preservatives, sweetening agents, flavoring agents, pharmaceutical grade dyes or pigments, and viscosity agents.

Flavoring agents and dyes and pigments among those useful herein include those described in Handbook of Pharmaceutical Excipients (4th ed., Pharmaceutical Press 2003).

Suitable co-solvents include, but are not limited to, ethanol, isopropanol, and acetone.

Suitable surfactants include, but are not limited to, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene monoalkyl ethers, sucrose monoesters, sodium lauryl sulfate, Tween 80®, and lanolin esters and ethers.

Suitable preservatives include, but are not limited to, phenol, alkyl esters of parahydroxybenzoic acid, benzoic acid and the salts thereof, boric acid and the salts thereof, sorbic acid and the salts thereof, chlorobutanol, benzyl alcohol, thimerosal, phenylmercuric acetate and nitrate, nitromersol, benzoalkonium chloride, cetylypridinium chloride, methyl paraben, and propyl paraben.

Suitable fillers include, but are not limited to, starch, lactose, sucrose, maltodextrin, and microcrystalline cellulose.

Suitable plasticizers include, but are not limited to, triethyl citrate, polyethylene glycol, propylene glycol, dibutyl phthalate, castor oil, acetylated monoglycerides, and triacetin.

Suitable polymers include, but are not limited to, ethylcellulose, cellulose acetate trimellitate, hydroxypropylmethylcellulose phthalate, cellulose acetate phthalate, polyvinyl acetate phthalate, and Eudragit® L 30-D, Eudragit® L 100-55, and Eudragit® S 100 (Rohm Pharma GmbH and Co. KG, Darmstadt, Germany), and Acryl-EZE® and Sureteric® (Colorcon, Inc., West Point, Pa.).

Suitable lubricants include, but are not limited to, magnesium stearate, stearic acid, and talc.

The pharmaceutical compositions described herein, in some embodiments, optionally comprise a chelating agent. The term “chelating agent,” as used herein, means a molecule containing two or more electron donor atoms that can form coordinate bonds to a single metal ion. The term “chelating agent” is understood to include the chelating agent as well as salts thereof. For example, the term “chelating agent” includes citric acid as well as its salt forms.

The most common and widely used chelating agents coordinate to metal atoms through oxygen or nitrogen donor atoms, or both. Other less common chelating agents coordinate through sulfur in the form of —SH (thiol or mercapto) groups. After the first coordinate bond is formed, each successive donor atom that binds creates a ring containing the metal atom. A chelating agent may be bidentate, tridentate, tetradentate, etc., depending upon whether it contains two, three, four, or more donor atoms capable of binding to the metal atom. See Kirk-Othmer Encyclopedia of Chemical Technology (4^(th) ed. 2001).

Chelating agents suitable for use in the compositions described herein include any pharmaceutically-acceptable chelating agent. Non-limiting examples of chelating agents suitable for use in the present invention include ethylenediaminetetraacetic acid (EDTA), citric acid, malic acid, tartaric acid, lactic acid, aspartic acid, glutamic acid, lysine, sodium hexametaphosphate, and combinations thereof. In one embodiment of the present invention, the chelating agent is EDTA, citric acid, or sodium hexametaphosphate. In certain preferred embodiments, the chelating agent is EDTA or salts thereof, in more preferred embodiments, the chelating agent is disodium EDTA. In certain embodiments, the bisphosphonate compounds described herein are formulated as oral dosage forms disclosed in U.S. Pat. No. 7,645,459 or U.S. Pat. No. 7,645,460, which are incorporated herein by reference in their entirety.

In another embodiment, a monodentate complexing agent is used in place of a polydentate chelating agent. Suitable monodentate complexing agents include, but are not limited to, phosphates (e.g., sodium phosphate, sodium aluminum phosphate, sodium acid phosphate, dipotassium phosphate, disodium phosphate, monobasic) and carboxylic acids (e.g., fumaric acid, acetic acid). In one embodiment, the monodentate complexing agent is acetic acid.

The amount of chelating agent present in the oral dosage form of the present invention will depend on the particular chelating agent selected and the amount of bisphosphonate compound present in the oral dosage form. Generally, the oral dosage forms of the present invention will contain a safe and effective amount of a chelating agent suitable for achieving the desired chelating effect. In one embodiment, the oral dosage form contains from about 10 mg to about 1000 mg of a chelating agent per unit dose. In another embodiment, the oral dosage forms contain from about 10 mg to about 500 mg of a chelating agent per unit dose. When the chelating agent is EDTA or salts thereof, the preferred range is from about 10 mg to about 500 mg, preferably from about 75 mg to about 250 mg, and more preferably from about 25 mg to about 250 mg per unit dose. When the chelating agent is citric acid or any other chelating agent, the preferred range is from about 25 mg to about 1000 mg, preferably from about 50 mg to about 500 mg per unit dose.

In some embodiments, the pharmaceutical compositions described herein optionally comprise a delayed release mechanism. The term “delayed release,” as used herein, refers to a delivery of a bisphosphonate active ingredient and a chelating agent which is achieved by formulating the pharmaceutical composition comprising the bisphosphonate and the chelating agent so that they will be released at a generally predictable location in the lower GI tract, more distal to that which would have been accomplished had there been no alteration in the delivery of the bisphosphonate and the chelating agent. In certain embodiments, the delayed release mechanism is selected from the group consisting of pH triggered delivery systems, bacterial enzyme triggered delivery systems, time dependent delivery systems and combinations thereof. In pH triggered delivery systems, the delayed release of the pharmaceutical composition may be achieved by coating the tablet, capsule, or particles, granules, or beads of the bisphosphonate and the chelating agent with a substance which is pH dependent, i.e., broken down or dissolves at a pH which is generally present in the lower GI tract, but not present in the upper GI tract (i.e., the mouth, buccal cavity, pharynx, esophagus, or stomach).

In some embodiments, the pharmaceutical compositions described herein optionally comprise a pH triggered delivery system of a film coating or an enteric coating. In some embodiments, the enteric coating enables the bisphosphonate compounds to avoid contacts with stomach acidic fluids. Excipients suitable for use in a film coating include, but are not limited to, hydroxypropylmethylcellulose, hydroxypropylcellulose, gelatin, polyvinylpyrrolidone, lactose, polyethylene glycol, talc, microcrystalline cellulose, and polyvinyl alcohol. Excipients suitable for use in an enteric coating include, but are not limited to, cellulose acetate trimelliate, hydroxypropylmethylcellulose phthalate, cellulose acetate phthalate, polyvinyl acetate phthalate, Eudragit® L 30-D, Eudragit® L 100-55, Eudragit® S 100 (Röhm Pharma GmbH and Co. KG, Darmstadt, Germany), Acryl-EZE® and Sureteric® (Colorcon, Inc., West Point, Pa.), triethyl citrate, polyethylene glycol, propylene glycol, dibutyl phthalate, castor oil, acetylated monoglycerides, triacetin, and talc.

Such pharmaceutical compositions are prepared, for example, using a method including admixing the compound or pharmaceutically acceptable salt or hydrate of the compound and a pharmaceutically acceptable excipient. Admixing is accomplished using methods well known for admixing a compound or a pharmaceutically acceptable salt or hydrate of a compound and a physiologically acceptable excipient. Examples of such excipients are well known to those skilled in the art and are prepared in accordance with acceptable pharmaceutical procedures, such as, for example, those described in Remington's Pharmaceutical Sciences, 17th edition, ed. Alfonoso R. Gennaro, Mack Publishing Company, Easton, Pa. (1985), which is incorporated herein by reference in its entirety. Satisfactory pharmaceutically acceptable excipients include those that are compatible with the other ingredients in the formulation and that are biologically acceptable.

The present compositions can take the form of solutions, suspensions, emulsion, tablets, pills, pellets, capsules, capsules containing liquids, powders, sustained-release formulations, suppositories, emulsions, aerosols, sprays, suspensions, or any other form suitable for use. In one embodiment, the composition is in the form of a capsule.

The compounds or pharmaceutically acceptable salts or hydrates of the compounds described herein may be administered orally or parenterally, neat or in combination with conventional pharmaceutical carriers as described above. The compounds or pharmaceutically acceptable salts or hydrates of the compounds described herein can also be administered by any convenient route, for example, orally, by infusion or bolus injection, by absorption through epithelial or mucocutaneous linings (e.g., oral, rectal, vaginal, and intestinal mucosa, etc.) and can be administered together with another therapeutic agent.

In some embodiments, the bisphosphonate cyclic acetal compounds described herein are administered as an adjuvant with one or more anti-inflammatory or immunomodulatory compounds. The use of higher affinity bisphosphonate compounds known in the art with anti-inflammatory compounds is limited due to toxicity issues related to the combination of these compounds. In particular, higher dosages of anti-inflammatory compounds are required to protect bone, when co-administered with known bisphosphonate compounds. Because of the higher dosages, however, side effects and other toxicity-related effects are quickly observed and the co-administration can be stopped. Because the bisphosphonate cyclic acetal compounds described herein have improved absorption which allows for lower dosage, however, they can be used effectively to protect bone in combination with anti-inflammatories or immunomodulatory agents at dosage levels that are low enough to not trigger toxic effects. Accordingly, the compounds described herein provide improved protection against bone erosion, while at the same time offering improved joint preservation, while inducing less overall skeletal turnover reduction than traditional bisphosphonates. In one embodiment, the compounds described herein are useful for inhibiting bone erosion. In another embodiment, the compounds described herein are useful for inhibiting both inflammation and bone erosion. For example, such anti-inflammatory, immunomodulatory and anti-erosion properties are achieved in some embodiments when the bisphosphonate cyclic acetal compounds described herein are co-administered with an anti-inflammatory or immunomodulatory agent. In these embodiments, the anti-inflammatory or immunomodulatory agent can be administered at lower doses than when administered on its own. Thus, in some embodiments, the bisphosphonate cyclic acetal compound is administered in combination or in sequence with the one or more anti-inflammatory or immunomodulatory compounds. Exemplary anti-inflammatory compounds include, without limitation, biologic anti-inflammatory compounds such as tumor necrosis factor antagonists (e.g., Enbrel®), NSAIDs, and methotrexate.

The synergy of the bisphosphonate cyclic acetal compounds described herein is also beneficial for treatment of osteoarthritis. In osteoarthritis, the afflicted joints are known to exhibit higher bone turnover. Treatment with a combination of one or more of the bisphosphonate cyclic acetal compounds described herein and an anti-inflammatory compound can normalize the turnover at these sites without producing excessive bone turnover in the remaining skeleton. In addition, the co-administration minimizes any potential antiapoptotic effects on chondrocytes that are delivered to this joint by the virtue of these lower affinity bisphosphonate analogs. The compounds described herein are useful for improvement of joint function.

Similarly, the compounds described herein can also be co-administered with anabolic compounds. With bisphosphonate compounds known in the art, a wash out phase is necessary when treating patients who have been previously administered anabolic compounds, such as parathyroid hormone and prostaglandins. The lower bone affinity of the compounds described herein, however, results in less interference with these anabolic agents. Accordingly, the compounds described herein can be administered to patients treated with anabolic agents with little or no washout period. In one embodiment, the compounds described herein are co-administered with one or more anabolic compounds. One exemplary anabolic compound is a compound based on parathyroid hormones (PTH) such as PTH 1-34 (Forteo®). Anabolic therapy is often prescribed to patients with very serious osteoporotic disease and/or those who do not respond to bisphosphonate therapy. Accordingly, the bisphosphonate cyclic acetal compounds described herein are useful for treatment of osteoporotic disease, as well as subjects who respond poorly to bisphosphonate therapy.

It is understood that the dosage, regimen and mode of administration of the bisphosphonate cyclic acetal compounds will vary according to the malady and the individual being treated and will be subject to the judgment of the medical practitioner involved. In some embodiments, administration of one or more of the compounds or pharmaceutically acceptable salts or hydrates of the compounds described herein begins at a low dose and is increased until the desired effects are achieved.

The bisphosphonate cyclic acetal compound or a pharmaceutically acceptable salt or hydrate thereof of this invention is delivered in an amount that is effective for treating or preventing bone metabolism disorder. In addition, in vitro or in vivo assays are optionally employed to help identify optimal dosage ranges. The precise dose to be employed will also depend on the route of administration, the condition, the seriousness of the condition being treated, as well as various physical factors related to the individual being treated, and should be decided according to the judgment of a health-care practitioner. The number and frequency of dosages corresponding to a completed course of therapy will be determined according to the judgment of a health-care practitioner.

The amount of the bisphosphonate cyclic acetal compound or a pharmaceutically acceptable salt or hydrate thereof of this invention that is effective for treating or preventing a central nervous system disorder will typically range from about 0.01 mg/kg to about 1 g/kg of body weight per day; in another embodiment, from about 1 mg/kg to about 600 mg/kg body weight per day; in another embodiment, from about 1 mg/kg to about 250 mg/kg body weight per day; in another embodiment, from about 10 mg/kg to about 400 mg/kg body weight per day; in another embodiment, from about 10 mg/kg to about 200 mg/kg of body weight per day; in another embodiment, from about 10 mg/kg to about 100 mg/kg of body weight per day; in one embodiment, from about 10 mg/kg to about 25 mg/kg body weight per day; in another embodiment, from about 1 mg/kg to about 10 mg/kg body weight per day; in another embodiment, from about 0.001 mg/kg to about 100 mg/kg of body weight per day; in another embodiment, from about 0.001 mg/kg to about 10 mg/kg of body weight per day; and in another embodiment, from about 0.001 mg/kg to about 1 mg/kg of body weight per day.

In one embodiment, the pharmaceutical composition is in unit dosage form. In such form, the composition is sub-divided in unit dose containing appropriate quantities of the compound or pharmaceutically acceptable salt or hydrate of the compound; the unit dosage form can be packaged compositions, for example, packeted powders, vials, ampoules, prefilled syringes or sachets containing liquids. The unit dosage form can be, for example, a capsule or tablet itself, or it can be the appropriate number of any such compositions in package form. Such unit dosage forms may contain from about 0.01 mg/kg to about 250 mg/kg, in one embodiment from about 1 mg/kg to about 250 mg/kg, in another embodiment from about 10 mg/kg to about 25 mg/kg, and may be given in a single dose or in two or more divided doses. Variations in the dosage will necessarily depend upon the species, weight and condition of the patient being treated and the patient's individual response to the medicament.

In one embodiment, the unit dosage form is about 0.01 to about 1000 mg. In another embodiment, the unit dosage form is about 0.01 to about 500 mg; in another embodiment, the unit dosage form is about 0.01 to about 250 mg; in another embodiment, the unit dosage form is about 0.01 to about 100 mg; in another embodiment, the unit dosage form is about 0.01 to about 50 mg; in another embodiment, the unit dosage form is about 0.01 to about 25 mg; in another embodiment, the unit dosage form is about 0.01 to about 10 mg; in another embodiment, the unit dosage form is about 0.01 to about 5 mg; and in another embodiment, the unit dosage form is about 0.01 to about 10 mg.

An enteric coating can be applied to the compressed tablet, the capsule (e.g., gelatin, starch, or hydroxypropylmethylcellulose) and/or the beads, particles or granules of active ingredient in a sufficient thickness so that the entire coating does not dissolve in gastrointestinal fluids at a pH below 5.5, but does dissolve at a pH of 5.5 or above. The dissolution or disintegration of the excipient coating generally does not occur until the entry of the coated dosage form into the small intestine.

It is expected that any anionic polymer exhibiting the requisite pH-dependent solubility profile can be used as an enteric coating in the practice of the present invention to achieve delivery of the bisphosphonate and chelating agent to the lower GI tract. The coating is chosen dependent upon compatibility with the particular bisphosphonate cyclic acetal compound selected. The preferred polymers for use in the present invention are anionic carboxylic polymers. It is particularly preferred that the polymers are acrylic polymers, and, more preferably, partly methyl-esterified methacrylic acid polymers, in which the ratio of free anionic carboxyl groups to ester groups is about 1:1.

A particularly suitable methacrylic acid copolymer is Eudragit L.R™, particularly Eudragit L 30 D-55.R™ and Eudragit L 100-55.R™, manufactured by Rohm Pharma GmbH and Co. KG, Darmstadt, Germany. In Eudragit L 30 D-55.R™, the ratio of free carboxyl groups to ester groups is approximately 1:1. Further, said copolymer is known to be insoluble in GI fluids having a pH below 5.5. That is, it is generally insoluble in the fluid of the upper GI tract having a pH of about 1.5 to 5.5, but readily soluble at pH above 5.5, which corresponds to the pH of the fluid in the lower GI tract.

Other methacrylic acid copolymer which are suitable for use in coating the oral dosage forms and/or the granules, particles, or beads of active ingredient which can be employed in the method of treatment described herein, either alone or in combination with other coatings, is Eudragit S.R™ and Eudragit FS30D.R™, manufactured by Rohm Pharma GmbH and Co. KG, Darmstadt, Germany. Eudragit S.R™ differs from Eudragit L 30 D-55.R™ only insofar as the ratio of free carboxyl groups to ester groups is approximately 1:2. Eudragit S.R™ is also, like Eudragit L 30 D-55.R™, substantially insoluble at pH below 5.5, but unlike Eudragit L 30 D-55.R™, is poorly soluble in GI fluids having a pH of 5.5-7.0, such as that present in small intestinal fluids. Eudragit S.R™ is soluble at pH 7.0 and above, such as that present in the terminal ileum and colon.

Eudragit S.R™ can also be used alone as a coating which would provide delivery of the bisphosphonate active ingredient beginning primarily at the large intestine (more distal than the terminal ileum) via a delayed-release mechanism. In addition, Eudragit S.R™, being poorly soluble in intestinal fluids below pH 7.0, can be used in combination with Eudragit L 30 D-55.R™, soluble in intestinal fluids above pH 5.5, in order to effect a delayed release composition which can be formulated to deliver the active ingredient at various segments of the intestinal tract; the more Eudragit L 30 D-55.R™ used, the more proximal release and delivery begins and the more Eudragit S.R™ used, the more distal release and delivery begins.

The coating can, and usually will, contain a plasticizer and possibly other coating excipients such as coloring agents, surfactant, talc, and/or magnesium stearate, many of which are well known in the coating art. In particular, anionic carboxylic acrylic polymers usually will contain 10-25% by weight of a plasticizer, especially triethyl citrate, tributyl citrate, acteyltriethyl citrate, dibutyl phthalate, diethyl phthalate, polyethylene glycol, acetylated monoglycerides propylene glycol, and triacetin. Conventional coating techniques such as fluid-bed or pan coating are employed to apply the coating. Coating thickness are sufficient to ensure that the oral dosage form remains essentially intact until the desired site of delivery in the lower GI tract is reached.

The solid oral dosage form may be in the form of a coated compressed tablet which contains particles or granules of the bisphosphonate active ingredient and the chelating agent, or of a soft or hard capsule (e.g., gelatin, starch, or hydroxypropylmethylcellulose), coated or uncoated, which contains beads or particles of the bisphosphonate active ingredient and the chelating agent, which themselves are enterically coated.

For sustained release of the bisphosphonate and chelating agent a sustained release polymer is required to control the dissolution rate of the bisphosphonate and chelating agent from the dosage final. If the bisphosphonate and chelating agent are both soluble (defined as 33 mg/ml or greater in water) then high levels of sustained release polymers are required. Sustained release polymers include but are not limited to, hydroxypropylmethylcellulose, hydroxypropylcellulose and Carbomer.

Methods of Use

The present invention further relates to a method of treating, preventing or ameliorating disorders of bone metabolism, such as those characterized by abnormal calcium and phosphate metabolism. These methods include the step of administering to a human or other mammal in need thereof a safe and effective amount of a pharmaceutical composition delivered to said human or other mammal via the oral dosage forms described herein.

Diseases characterized by abnormal calcium and phosphate metabolism include, but are not limited to, osteoporosis, secondary osteoporosis, secondary osteoporosis stemming from osteoporosis, osteoarthritis, Paget's disease (osteitis deformans), hyperparathyroidism, hypercalcemia of malignancy, osteolytic bone metastasis, myositis ossificans progressiva, calcinosis universalis, and such afflictions as arthritis, neuritis, bursitis, tendonitis, bone pain, and other inflammatory conditions which predispose involved tissue to loss or deposition of calcium phosphates. The compounds described herein are also useful for other bone disorders and conditions such as, without limitation, fracture repair, prosthesis integration, and osteonecrosis (e.g., of hip or knee). The compounds described herein are also useful for the prevention and treatment of skeletal related events associated with cancer such as metastasis, tumor growth, bone pain, fractures, and such afflictions as arthritis (including bone disease and joint function in osteoarthritis). Further, the compounds described herein are also useful for treatment and prevention of additional skeletal related events induced during the treatment of cancer, such as hormone ablation therapy, aromatase inhibitor therapy, and androgen ablation therapy, particularly in patients suffering from breast or cancer patients.

In other embodiments, the disorder may be a non-skeletal disorder such as, but not limited to, a non-bone cancer, an immunomodulatory disorder, an inflammatory disorder, or a parasitic disorder. In these embodiments, the parasitic disorder can be, but is not limited to, malaria, leishmaniasis, a trypanasomal disease, an entamoebal infection, a giardia infection, and a cryptosporidial infection.

The compounds described herein are also useful for the prevention and treatment of parasitic disorders such as malaria and Chagas disease, and disorders of the gastrointestinal tract such as intestinal parasites, and irritable bowel disease. In some embodiments, the compounds described herein are, in some embodiments, useful to inhibit or treat parasitic infections, such as protozoan infections and diseases including malaria trypanasomes leishmania, entomaeba, cryptosporidium, and giardia.

In some embodiments, the compounds described herein are useful for treating or preventing inflammation disorders. Such disorders include, without limitation, rheumatoid arthritis, and irritable bowel disease. In some embodiments, when used for treating or preventing inflammation disorders, the compounds described herein are used in combination with one or more anti-inflammatory compounds.

In some embodiments, the compounds described herein are useful for treating, preventing or ameliorating dental disorders. Exemplary disorders include, without limitation, cavities and periodontal disease. In some embodiments, the compounds described herein are useful for treatment related to dental surgical procedures, such as tooth implantation.

In some embodiments, the compounds described herein are useful for treatment related to orthopedic joint implants, for example, to improve fixation of artificial joins, or to prevent loosening of implanted joints. In further embodiments, the compounds described herein have orthopedic uses, such as to promote or facilitate fracture repair and bone regeneration, either when used as a sole therapy on in conjunction with other pharmaceutical or non-pharmaceutical orthopedic therapy.

In further embodiments, the bisphosphonate cyclic acetal compounds described herein offer orthopedic utility in the outcomes of hip, knee or other skeletal sites in both pediatric and adult populations.

The oral dosage forms described herein are suitable for administration to pediatric or adult patients in need of such treatment.

In some embodiments, the bisphosphonate cyclic acetal compounds described herein are useful as part of hormone ablation therapy, for example, in patients suffering from breast cancer or prostate cancer. In some embodiments, the bisphosphonate cyclic acetal compounds described herein are useful as part of aromatase inhibitor therapy, for example, in patients suffering from cancer. In some embodiments, the bisphosphonate cyclic acetal compounds described herein are useful as part of androgen ablation therapy, for example, in patients suffering from prostate cancer or other diseases.

Administration of the bisphosphonate cyclic acetal compounds described herein can be accomplished via any mode of administration for therapeutic agents. These modes include systemic or local administration such as oral, nasal, parenteral, transdermal, subcutaneous, vaginal, buccal, rectal or topical administration modes.

Depending on the intended mode of administration, the compositions containing the bisphosphonate cyclic acetal compounds described herein can be in solid, semi-solid or liquid dosage form, such as, for example, injectables, tablets, suppositories, pills, time-release capsules, elixirs, tinctures, emulsions, syrups, powders, liquids, suspensions, or the like, sometimes in unit dosages and consistent with conventional pharmaceutical practices. Likewise, they can also be administered in intravenous (both bolus and infusion), intraperitoneal, subcutaneous or intramuscular form, in all manners known to those skilled in the pharmaceutical arts.

The oral dosage forms of the present invention are suitable for administration to a patient according to a continuous dosing interval of daily, weekly, three times per month, twice monthly, and monthly.

When administered for the treatment or inhibition of a particular disease state or disorder, it is understood that the effective dosage may vary depending upon the particular the bisphosphonate cyclic acetal compounds or pharmaceutically acceptable salts or hydrates thereof of this invention utilized, the mode of administration, the condition, and severity thereof, of the condition being treated, as well as the various physical factors related to the individual being treated. In therapeutic application, the bisphosphonate cyclic acetal compounds and pharmaceutically acceptable salts or hydrates thereof described herein are provided to a patient already suffering from a disease in an amount sufficient to cure or at least partially ameliorate the symptoms of the disease and its complications. An amount adequate to accomplish this is defined as a “therapeutically effective amount.” The dosage to be used in the treatment of a specific case can be subjectively determined by the attending physician. The variables involved include the specific condition and the size, age and response pattern of the patient.

The bisphosphonate cyclic acetal compounds and pharmaceutically acceptable salts or hydrates thereof described herein are also useful in the manufacture of medicaments for treating a bone metabolism disorder in a mammal. Similarly, the bisphosphonate cyclic acetal compounds and pharmaceutically acceptable salts or hydrates thereof described herein are also useful in the manufacture of medicaments for treating a bone metabolism disorder.

The following examples illustrate the production of representative compounds described herein.

EXAMPLES

The following examples illustrate the production of representative compounds described herein. In some instances, it will be readily understood that the products may have included the monosodium salt in combination with the disodium salt.

Section 1. Synthesis of Substituted Benzaldehydes.

Substituted benzaldehydes were either commercially available or synthesized accordingly to the following procedures.

Example 1 4-Formylphenyl octanoate

To a 250 mL dry round bottom flask were added 4-hydroxybenzaldehyde (6.11 g, 50.0 mmol) and anhydrous CH₂Cl₂ (50 mL). The solution was cooled in an ice-water bath, then pyridine (8.09 mL, 100 mmol) was added. To the resulting solution, octanoyl chloride (10.3 mL, 60 mmol) was added slowly under stirring and N₂. The mixture was first stirred at 0° C. for 2 hours, then at room temperature for 20 hours. To the reaction mixture, water (100 mL) was added and the CH₂Cl₂ layer was separated. The aqueous layer was extracted continually with CH₂Cl₂ (100 mL×2). The combined CH₂Cl₂ solution was dried over Na₂SO₄. After removal of the solvent, the residue was purified with a silica gel chromatography (heptane/ethyl acetate, gradient eluting) to give 4-formylphenyl octanoate (10.7 g) as colorless oil. Yield: 86%. ¹H NMR (CDCl₃, 300 MHz): δ=9.98 (s, 1H), 7.91 (d, J=8.7 Hz, 2H), 7.26 (d, J=8.4 Hz, 2H), 2.58 (t, J=6.9 Hz, 2H), 1.38-0.86 (m, 13H). ¹³C NMR (CDCl₃, 75.5 MHz): δ=191.0, 171.7, 155.6, 134.0, 131.3, 122.5, 34.5, 31.7, 29.1, 29.0, 24.9, 22.7, 14.2.

Example 2 4-Formylphenyl isopropyl carbonate

To a 250 mL dry round bottom flask were added 4-hydroxybenzaldehyde (4.88 g, 40.0 mmol), anhydrous CH₂Cl₂ (40 mL) and pyridine (4.2 mL, 52.0 mmol). The mixture was stirred in an ice-water bath, then a solution of isopropyl chloroformate in toluene (1.0 M, 48.0 mL) was added. After stirring at 0° C. for 2 hours, water (100 mL) and MTBE (300 mL) were added to the reaction mixture. The aqueous layer was separated, and the MTBE layer was washed, respectively, with cold water (80 mL), cold 5% NaOH aqueous solution (80 mL), cold water (80 mL), cold 0.5 N HCl aqueous solution (80 mL) and cold water (80 mL). The organic layer was dried over Na₂SO₄, and the solvent was evaporated to give 4-formylphenyl isopropyl carbonate (8.50 g) as pale yellow oil. Yield: 100%. ¹H NMR (CDCl₃, 300 MHz): δ=9.71 (s, 1H), 7.64 (d, J=8.4 Hz, 2H), 7.10 (d, J=8.7 Hz, 2H), 4.73 (seventet, J=6.0 Hz, 1H), 1.12 (d, J=6.3 Hz, 6H).

Example 3 3,5-Difluoro-4-formylphenyl 2-oxooxazolidine-3-carboxylate

To a 250 mL dry round bottom flask were added 2-oxazolidinone (4.35 g, 50.0 mmol), triphosgene (5.49 g, 18.5 mmol) and anhydrous THF (80 mL). The mixture was stirred in an ice-water bath, then triethylamine (9.8 mL, 70.0 mmol) was added slowly. After stirring at 0° C. for 1 hour, the mixture was stirred continually at room temperature overnight. The reaction mixture was filtered and the filtrate was concentrated. The residue was dissolved in 20 mL of CH₂Cl₂, and this solution was added slowly to a stirring mixture of 2,6-difluoro-4-hydroxybenzaldehyde (5.93 g, 27.5 mmol) and pyridine (4.44 mL, 55.0 mmol) in 30 mL of anhydrous CH₂Cl₂ at 0° C. After stirring at room temperature for 10 hours, water (100 mL) was added to the reaction mixture. The CH₂Cl₂ layer was separated, and the aqueous layer was extracted continually with CH₂Cl₂ (50 mL×4). The combined CH₂Cl₂ solution was dried over Na₂SO₄. After removal of the solvent, the residue was purified with a silica gel chromatography (heptane/ethyl acetate, gradient eluting) to give 3,5-difluoro-4-formylphenyl 2-oxooxazolidine-3-carboxylate (4.92 g) as a white solid. Yield: 33%. ¹H NMR (CDCl₃, 300 MHz): δ=10.29 (s, 1H), 6.98 (dd, J=10.8, 2.1 Hz, 2H), 4.51 (t, J=7.8 Hz, 2H), 4.18 (t, J=7.6 Hz, 2H). ¹³C NMR (CDCl₃, 75.5 MHz): δ=183.5, 163.7 (dd, J=263.6, 8.00 Hz), 151.2, 148.0, 112.6, 106.8 (dd, J=25.7, 3.70 Hz), 62.1, 43.7.

Example 4 3-Formylphenyl butyrate

To a 250 mL dry round bottom flask were added 3-hydroxybenzaldehyde (5.0 g, 41.0 mmol), anhydrous CH₂Cl₂ (50 mL). The solution was cooled in an ice-water bath, then pyridine (6.64 mL, 82.0 mmol) was added. To the resulting solution, butyryl chloride (5.15 mL, 49.2 mmol) was added slowly under stirring and N₂. The mixture was first stirred at 0° C. for 2 hours, then at room temperature for 20 hours. To the reaction mixture, water (80 mL) was added and the CH₂Cl₂ layer was separated. The aqueous layer was extracted continually with CH₂Cl₂ (50 mL×3). The combined CH₂Cl₂ solution was dried over Na₂SO₄. After removal of the solvent, the residue was purified with a silica gel chromatography (heptane/ethyl acetate, gradient eluting) to give 3-formylphenyl butyrate (5.9 g) as colorless oil. Yield: 75%. ¹H NMR (CDCl₃, 300 MHz): δ=9.96 (s, 1H), 7.72 (t of d, J=1.2, 7.5 Hz, 1H), 7.60 (t, J=2.4 Hz, 1H), 7.52 (t, J=8.1 Hz, 1H), 7.36-7.32 (m, 1H), 2.56 (t, J=7.5 Hz, 2H), 1.78 (sextet, J=7.2 Hz, 2H), 1.04 (t, J=7.5 Hz, 3H). ¹³C NMR (CDCl₃, 75.5 MHz): δ=191.2, 171.7, 151.3, 137.7, 130.1, 127.8, 127.2, 122.2, 36.0, 18.3, 13.5.

Example 5 Ethyl 4-formylphenyl carbonate

To a 250 mL dry round bottom flask were added 4-hydroxybenzaldehyde (6.11 g, 50.0 mmol), anhydrous CH₂Cl₂ (150 mL). The solution was cooled in an ice-water bath, then pyridine (4.86 mL, 60.0 mmol) was added. To the resulting solution, ethyl chloroformate (4.78 mL, 50.0 mmol) was added slowly under stirring and N₂. The mixture was stirred and warmed to room temperature, then stirred at room temperature overnight. To the reaction mixture, water (100 mL) was added and the CH₂Cl₂ layer was separated. The aqueous layer was extracted continually with CH₂Cl₂ (100 mL×2). The combined CH₂Cl₂ solution was dried over Na₂SO₄. After removal of the solvent, the residue was purified with a silica gel chromatography (heptane/ethyl acetate, gradient eluting) to give ethyl 4-formylphenyl carbonate (8.92 g) as colorless oil. Yield: 92%. ¹H NMR (CDCl₃, 300 MHz): δ=10.07 (s, 1H), 8.00 (d, J=8.7 Hz, 2H), 7.45 (d, J=8.7 Hz, 2H), 4.42 (q, J=7.2 Hz, 2H), 1.47 (t, J=7.2 Hz, 3H). ¹³C NMR (CDCl₃, 75.5 MHz): δ=191.0, 155.7, 152.9, 134.2, 131.4, 121.9, 65.4, 14.3.

Example 6 4-Formylphenyl tetrahydro-2H-pyran-4-carboxylate

To a 100 mL dry round bottom flask were added tetrahydro-pyran-4-carboxylic acid (2.8 g, 21.5 mmol), thionyl chloride (2.8 mL, 34.4 mmol). The mixture was refluxed for 45 minutes, then all the volatile materials were rotary-evaporated. To the residue, anhydrous CH₂Cl₂ (10 mL) was added. The resulting solution was cooled to 0° C., and pyridine (2.63 g, 21.5 mmol) was added, followed by a solution of 4-hydroxybenzaldehyde (2.04 g, 25.8 mmol) in anhydrous CH₂Cl₂ (30 mL). The reaction mixture was stirred and warmed from 0° C. to room temperature slowly, then at room temperature overnight. To the reaction mixture, water (60 mL) was added and the CH₂Cl₂ layer was separated. The aqueous layer was extracted continually with CH₂Cl₂ (50 mL×3). The combined CH₂Cl₂ solution was washed with a cold aqueous solution of saturated NaHCO₃ (80 mL). After drying and removal of the solvent, the residue was purified with a silica gel chromatography (heptane/ethyl acetate, gradient eluting) to give 4-formylphenyl tetrahydro-2H-pyran-4-carboxylate (4.40 g) as colorless oil. Yield: 87%. ¹H NMR (CDCl₃, 300 MHz): δ=9.97 (s, 1H), 7.91 (d, J=8.7 Hz, 2H), 7.27 (d, J=8.4 Hz, 2H), 4.06-4.00 (m, 2H), 3.55-3.47 (m, 2H), 2.88-2.81 (m, 1H), 2.03-1.88 (m, 4H). ¹³C NMR (CDCl₃, 75.5 MHz): δ=190.9, 172.2, 155.3, 133.9, 131.1, 122.2, 115.9, 66.8, 40.1, 28.4.

Example 7 4-Formylphenyl morpholine-4-carboxylate

To a 250 mL dry round bottom flask were added 4-hydroxybenzaldehyde (6.11 g, 50.0 mmol), anhydrous CH₂Cl₂ (80 mL) and pyridine (4.86 mL, 60.0 mmol). The mixture was stirred in an ice-water, then 4-morpholinecarbonyl chloride (6.12 mL, 52.5 mmol) was added. The mixture was stirred and warmed slowly to room temperature, then stirred at room temperature overnight. An aqueous solution of 5% NaHCO₃ (100 mL) was added to the reaction mixture. The CH₂Cl₂ layer was separated, and the aqueous layer was extracted continually with CH₂Cl₂ (50 mL×2). The combined CH₂Cl₂ solution was dried over Na₂SO₄. Removal of the solvent gave 4-formylphenyl morpholine-4-carboxylate (8.80 g) as white solid. Yield: 75%. ¹H NMR (CDCl₃, 300 MHz): δ=9.97 (s, 1H), 7.90 (d, J=9.0 Hz, 2H), 7.30 (d, J=9.0 Hz, 2H), 3.77-3.57 (m, 6H). ¹³C NMR (CDCl₃, 75.5 MHz, mixture of two isomers): δ=191.0, 156.0, 152.6, 133.6, 131.1, 122.3, 66.5, 66.4, 45.0, 44.2.

Example 8 2-Fluoro-4-formylphenyl morpholine-4-carboxylate

To a 250 mL dry round bottom flask were added 3-fluoro-4-hydroxybenzaldehyde (4.76 g, 34.0 mmol), anhydrous CH₂Cl₂ (40 mL) and pyridine (3.6 mL, 44.2 mmol). The mixture was stirred in an ice-water bath, then 4-morpholinecarbonyl chloride (4.4 mL, 37.4 mmol) was added. The mixture was stirred and warmed slowly to room temperature, then at room temperature overnight. Water (80 mL) was added to the reaction mixture. The CH₂Cl₂ layer was separated, and the aqueous layer was extracted continually with CH₂Cl₂ (50 mL×3). The combined CH₂Cl₂ solution was dried over Na₂SO₄. After removal of the solvent, the residue was purified with a silica gel chromatography (heptane/ethyl acetate, gradient eluting) to give 2-fluoro-4-formylphenyl morpholine-4-carboxylate (7.45 g) as white solid. Yield: 87%. ¹H NMR (CDCl₃, 300 MHz): δ=9.97 (s, 1H), 7.74-7.70 (m, 2H), 7.45 (t, J=7.8 Hz, 1H), 3.81-3.61 (m, 8H). ¹³C NMR (CDCl₃, 75.5 MHz, mixture of two isomers): δ=189.9, 156.5, 153.1, 151.8, 144.0, 143.8, 135.0, 134.9, 126.7, 126.6, 124.8, 116.7, 116.4, 66.4, 66.3, 45.2, 44.4.

Example 9 3,5-Difluoro-4-formylphenyl morpholine-4-carboxylate

To a 250 mL dry round bottom flask were added 2,6-difluoro-4-hydroxybenzaldehyde (5.53 g, 35.0 mmol), anhydrous CH₂Cl₂ (40 mL) and pyridine (3.68 mL, 45.5 mmol). The mixture was stirred in an ice-water bath, then 4-morpholinecarbonyl chloride (4.4 mL, 37.4 mmol) was added. After stirring at 0° C. for 1 hour, the mixture was stirred at room temperature overnight. Water (80 mL) and CH₂Cl₂ (50 mL) were added to the reaction mixture. The CH₂Cl₂ layer was separated, and the aqueous layer was extracted continually with CH₂Cl₂ (50 mL×3). The combined CH₂Cl₂ solution was dried over Na₂SO₄. After removal of the solvent, the residue was purified with a silica gel chromatography (heptane/ethyl acetate, gradient eluting) to give 3,5-difluoro-4-formylphenyl morpholine-4-carboxylate (8.90 g) as white solid. Yield: 94%. ¹H NMR (CDCl₃, 300 MHz): δ=10.28 (s, 1H), 6.91 (dd, J=10.8, 1.5 Hz, 2H), 3.77-3.58 (m, 8H). ¹³C NMR (CDCl₃, 75.5 MHz, mixture of two isomers): δ=183.7, 163.8 (dd, J=263.1, 8.53 Hz), 157.0 (t, J=15.3 Hz), 151.8, 111.7 (t, J=11.5 Hz), 106.6 (dd, J=25.1, 3.70 Hz), 66.6, 66.5, 45.2, 44.5.

Example 10 2-Fluoro-4-formylphenyl dimethylcarbamate

To a 250 mL dry round bottom flask were added 3-fluoro-4-hydroxybenzaldehyde (4.90 g, 35.0 mmol), anhydrous CH₂Cl₂ (20 mL) and pyridine (3.68 mL, 45.5 mmol). The mixture was stirred in an ice-water bath, then dimethylcarbamic chloride (3.54 mL, 38.5 mmol) was added. The mixture was stirred at room temperature for 62 hours. Water (80 mL) and CH₂Cl₂ (50 mL) were added to the reaction mixture. The CH₂Cl₂ layer was separated, and the aqueous layer was extracted continually with CH₂Cl₂ (50 mL×3). The combined CH₂Cl₂ solution was dried over Na₂SO₄. After removal of the solvent, the residue was purified with a silica gel chromatography (heptane/ethyl acetate, gradient eluting) to give 2-fluoro-4-formylphenyl dimethylcarbamate (7.10 g) as white solid. Yield: 96%. ¹H NMR (CDCl₃, 300 MHz): δ=9.92 (d, J=1.8 Hz, 1H), 7.69-7.64 (m, 2H), 7.40 (t, J=7.5 Hz, 1H), 3.13 (s, 3H), 3.03 (s, 3H). ¹³C NMR (CDCl₃, 75.5 MHz): δ=190.0, 156.5, 153.0 (d, J=17.1 Hz), 144.2 (d, J=12.8 Hz), 134.7 (d, J=5.5 Hz), 126.6 (d, J=3.6 Hz), 124.8, 116.5, 116.2, 36.8, 36.5. ¹⁹F NMR (CDCl₃, 282.3 MHz): δ=−127.5.

Example 11 2-Fluoro-6-formylphenyl morpholine-4-carboxylate

To a 250 mL dry round bottom flask were added 3-fluoro-2-hydroxybenzaldehyde (4.90 g, 35.0 mmol), anhydrous CH₂Cl₂ (50 mL) and pyridine (3.40 mL, 42.0 mmol). The mixture was stirred in an ice-water bath, then 4-morpholinecarbonyl chloride (4.50 mL, 38.5 mmol) was added. The mixture was stirred at room temperature for 24 hours. Water (80 mL) was added to the reaction mixture. The CH₂Cl₂ layer was separated, and the aqueous layer was extracted continually with CH₂Cl₂ (100 mL×2). The combined CH₂Cl₂ solution was dried over Na₂SO₄. After removal of the solvent, the residue was purified with a silica gel chromatography (heptane/ethyl acetate, gradient eluting) to give 2-fluoro-6-formylphenyl morpholine-4-carboxylate (8.34 g) as white solid. Yield: 94%. ¹H NMR (CDCl₃, 300 MHz): δ=10.06 (s, 1H), 7.58 (dt, J=7.8, 1.5 Hz, 1H), 7.39-7.22 (m, 2H), 3.69 (br, 6H), 3.50 (br, 2H). ¹³C NMR (CDCl₃, 75.5 MHz, mixture of two isomers): δ=187.6, 187.5, 170.5, 156.4, 152.4 (d, J=100.7 Hz), 139.9 (d, J=12.8 Hz), 130.5, 126.5 (d, J=7.3 Hz), 125.2 (d, J=3.1 Hz), 121.7 (d, J=17.4 Hz), 66.1, 45.0, 44.3.

Example 12 3,5-Difluoro-4-formylphenyl isopropyl carbonate

To a 250 mL dry round bottom flask were added 2,6-difluoro-4-hydroxy-benzaldehyde (4.80 g, 30.4 mmol), anhydrous CH₂Cl₂ (30 mL) and pyridine (3.0 mL, 36.5 mmol). The mixture was stirred in an ice-water bath, then a solution of isopropyl chloroformate in toluene (1.0 M, 33.4 mL) was added. After stirring at 0° C. for 2 hours, the mixture was stirred at room temperature overnight. Water (80 mL) was added to the reaction mixture. The CH₂Cl₂ layer was separated, and the aqueous layer was extracted continually with CH₂Cl₂ (80 mL×3). The combined CH₂Cl₂ solution was dried over Na₂SO₄. After removal of the solvent, the residue was purified with a silica gel chromatography (heptane/ethyl acetate, gradient eluting) to give 3,5-difluoro-4-formylphenyl isopropyl carbonate (6.20 g) as a colorless oil. Yield: 84%. ¹H NMR (CDCl₃, 300 MHz): δ=10.30 (s, 1H), 7.02-6.96 (m, 2H), 5.03 (seventet, J=6.3 Hz, 1H), 1.43 (d, J=6.3 Hz, 6H). ¹³C NMR (CDCl₃, 75.5 MHz): δ=183.3, 163.6 (dd, J=262.5, 7.92 Hz), 156.3 (t, J=15.2 Hz), 151.1, 111.9 (t, J=11.5 Hz), 106.0 (dd, J=25.1, 3.62 Hz), 74.5, 21.5. ¹⁹F NMR (CDCl₃, 282.3 MHz): δ=−113.0 (d, J=9.0 Hz).

Example 13 3,5-Difluoro-4-formylphenyl octan-2-yl carbonate

To a 250 mL dry round bottom flask were added 2-octanol (4.51 g, 34.6 mmol), triphosgene (3.44 g, 11.6 mmol) and anhydrous THF (100 mL). The mixture was stirred in an ice-water bath, then pyridine (5.6 mL, 69.2 mmol) was injected slowly. After stirring at room temperature for 30 minutes, the mixture was filtered, and the filtrate was concentrated. The residue was dissolved in 15 mL of CH₂Cl₂ and cooled in an ice-water bath. To this stirring solution, a solution of 2,6-difluoro-4-hydroxybenzaldehyde (4.2 g, 26.6 mmol) and pyridine (2.80 mL, 34.6 mmol) in 20 mL of anhydrous CH₂Cl₂ was added slowly. After stirring at room temperature for 2 hours, water (80 mL) was added to the reaction mixture. The CH₂Cl₂ layer was separated, and the aqueous layer was extracted continually with CH₂Cl₂ (100 mL×3). The combined CH₂Cl₂ solution was dried over Na₂SO₄. After removal of the solvent, the residue was purified with a silica gel chromatography (heptane/ethyl acetate, gradient eluting) to give 3,5-difluoro-4-formylphenyl octan-2-yl carbonate (5.0 g) as a colorless oil. Yield: 46%. ¹³C NMR (CDCl₃, 75.5 MHz): δ=183.2, 163.4 (dd, J=263.0, 8.53 Hz), 156.3 (t, J=15.2 Hz), 151.2, 111.8 (t, J=11.0 Hz), 105.9 (dd, J=25.7, 3.62 Hz), 78.0, 35.6, 31.6, 28.9, 25.1, 22.4, 19.6, 13.9.

Example 14 (3-Fluoro-4-formylphenoxy)methyl butyrate

To a 500 mL dry round bottom flask a were added 2-fluoro-4-hydroxybenzaldehyde (5.60 g, 40 mmol), anhydrous K₂CO₃ (10.6 g, 76.9 mmol) and acetone (200 mL). The mixture was stirred at room temperature for 30 minutes. To another 500 mL dry round bottom flash b were added chloromethyl butyrate (9.33 g, 61.5 mmol), KI (14.2 g, 66.6 mmol) and acetone (150 mL). This mixture was also stirred at room temperature for 30 minutes. After the solid settled down on the glassware bottom, the top yellow acetone solution in flask b was decanted into the stirring solution in the round bottom flask a. The resulting mixture was refluxed for 4 hours. Most acetone was rotary evaporated, and the residual solid was triturated with methyl tert-butyl ether (MTBE) three times (100 mL, 50 mL, 50 mL). The MTBE extract was concentrated, and the residue was purified with a silica gel chromatography (heptane/ethyl acetate, gradient eluting) to give (3-fluoro-4-formylphenoxy)methyl butyrate (6.40 g) as a colorless oil. Yield: 43%. ¹H NMR (CDCl₃, 300 MHz): δ=10.18 (s, 1H), 7.80 (t, J=8.7 Hz, 1H), 6.93-6.89 (m, 1H), 6.82 (dd, J=12.3, 2.1 Hz, 1H), 5.83 (s, 2H), 2.36 (t, J=7.5 Hz, 2H), 1.64 (sextet, J=7.5 Hz, 2H), 0.92 (t, J=7.5 Hz, 3H). ¹³C NMR (CDCl₃, 75.5 MHz): δ=185.5 (d, J=6.1 Hz), 169.7 (d, J=258.8 Hz), 162.8 (d, J=12.2 Hz), 130.2 (d, J=3.7 Hz), 119.1 (d, J=8.5 Hz), 112.4 (d, J=3.1 Hz), 103.5 (d, J=24.4 Hz), 84.1, 35.7, 18.0, 13.3.

Example 15 3,5-Dichloro-4-formylphenyl isopropyl carbonate

The synthesis of 2,6-dichloro-4-hydroxybenzaldehyde as depicted in the above scheme followed the procedures disclosed in: Hirschheydt, T. V.; Voss, E. Synthesis 2004, 12, 2062.

To a 250 mL dry round bottom flask were added 2,6-dichloro-4-hydroxybenzaldehyde (5.73 g, 30.0 mmol), anhydrous CH₂Cl₂ (30 mL) and pyridine (3.0 mL, 36.5 mmol). The mixture was stirred in an ice-water bath, then a solution of isopropyl chloroformate in toluene (1.0 M, 33.4 mL) was added. After stirring at 0° C. for 2 hours, water (100 mL) and CH₂Cl₂ (50 mL) were added to the reaction mixture. The CH₂Cl₂ layer was separated, and the aqueous layer was extracted continually with CH₂Cl₂ (40 mL×3). The combined CH₂Cl₂ solution was dried over Na₂SO₄. After removal of the solvent, the residue was purified with a silica gel chromatography (heptane/ethyl acetate, gradient eluting) to give 3,5-dichloro-4-formylphenyl isopropyl carbonate (6.72 g) as a colorless oil. Yield: 81%. ¹H NMR (CDCl₃, 300 MHz): δ=10.53 (s, 1H), 7.41 (s, 2H), 5.09 (seventet, J=6.3 Hz, 1H), 1.48 (d, J=6.3 Hz, 6H). ¹³C NMR (CDCl₃, 75.5 MHz): δ=187.8, 153.8, 151.5, 138.0, 127.8, 122.8, 74.6, 21.8.

Example 16 3,5-Difluoro-4-formylphenyl 5,5-dimethyl-2-oxooxazolidine-3-carboxylate

The synthesis of 5,5-Dimethyl-oxazolidin-2-one as depicted in the above scheme followed the procedures disclosed in: Bull, S. D.; Davies, S. G.; Jones, S.; Sanganee, H. J. J. Chem. Soc. Perkin Trans. 1 1999, 4, 387.

To a 250 mL dry round bottom flask were added 5,5-dimethyl-oxazolidin-2-one (5.10 g, 44.3 mmol), triphosgene (5.26 g, 17.7 mmol) and anhydrous THF (80 mL). The mixture was stirred in an ice-water bath, then triethylamine (8.6 mL, 62.0 mmol) was added slowly. The resulting mixture was stirred at room temperature overnight. The reaction mixture was filtered and the filtrate was concentrated. To the residue was added 2,6-difluoro-4-hydroxybenzaldehyde (5.03 g, 31.9 mmol) and 80 mL of CH₂Cl₂. The resulting solution was cooled in an ice-water bath, then triethylamine (6.0 mL, 42.5 mmol) was added. After stirring at room temperature for 7 hours, water (100 mL) was added to the reaction mixture. The CH₂Cl₂ layer was separated, and the aqueous layer was extracted continually with CH₂Cl₂ (50 mL×3). The combined CH₂Cl₂ solution was dried over Na₂SO₄. After removal of the solvent, the residue was purified with a silica gel chromatography (heptane/ethyl acetate, gradient eluting) to give 3,5-difluoro-4-formylphenyl 5,5-dimethyl-2-oxooxazolidine-3-carboxylate (6.9 g) as a pale yellow crystal. Yield: 52%. ¹H NMR (CDCl₃, 300 MHz): δ=10.39 (s, 1H), 7.09 (d, J=9.0 Hz, 2H), 3.97 (s, 2H), 1.67 (s, 6H).

Example 18 (S)-3,5-Difluoro-4-formylphenyl 2-(acetoxymethyl)pyrrolidine-1-carboxylate

The synthesis of (S)-(−)-1-benzyl-2-pyrrolidinemethyl acetate as depicted in the above scheme followed the procedures disclosed in: Zhao, S.; Freeman, J. P.; Bacon, C. L.; Fox, G. B.; O'Driscoll, E.; Foley, A. G.; Kelly, J.; Farrell, U.; Regan, C.; Mizsac, S. A.; Szmuszkovicz, J. Bioorg. Med. Chem. 1999, 7, 1647.

To a 500 mL dry round bottom flask were added triphosgene (8.90 g, 30.0 mmol) and anhydrous CH₂Cl₂ (300 mL). The mixture was stirred in an dry ice-acetone bath, then a solution of (S)-(−)-1-benzyl-2-pyrrolidinemethyl acetate (21.0 g, 90.0 mmol) in 50 mL of CH₂Cl₂ was added slowly. After the addition, the resulting mixture was cooled in an ice-water bath, then warmed slowly to room temperature and was stirred at room temperature overnight. After removal of the volatile materials, the residue was purified with a silica gel chromatography (heptane/ethyl acetate, gradient eluting) to give (S)-(1-(chlorocarbonyl)pyrrolidin-2-yl)methyl acetate (15.3 g) as a colorless oil. Yield: 83%. ¹H NMR (CDCl₃, 300 MHz, mixture of two isomers): δ=4.30-4.07 (m, 3H), 3.65-3.50 (m, 2H), 2.11-1.90 (m, 7H). ¹³C NMR (CDCl₃, 75.5 MHz, mixture of two isomers): δ=170.4, 170.3, 146.9, 146.1, 63.9, 63.0, 59.2, 58.1, 50.7, 48.9, 28.1, 27.6, 22.9, 22.8, 20.6.

To a 250 mL dry round bottom flask were added (S)-(1-(chlorocarbonyl)pyrrolidin-2-yl)methyl acetate (6.79 g, 33.0 mmol), 2,6-difluoro-4-hydroxybenzaldehyde (4.74 g, 30 mmol), triethylamine (5.40 mL, 39.0 mmol) and anhydrous CH₂Cl₂ (40 mL). The resulting mixture was stirred at room temperature for 2 days, then water (80 mL) was added to the reaction mixture. The CH₂Cl₂ layer was separated, and the aqueous layer was extracted continually with CH₂Cl₂ (80 mL×2). The combined CH₂Cl₂ solution was dried over Na₂SO₄. After removal of the solvent, the residue was purified with a silica gel chromatography (heptane/ethyl acetate, gradient eluting) to give (S)-3,5-difluoro-4-formylphenyl 2-(acetoxymethyl)pyrrolidine-1-carboxylate (4.92 g) as a colorless oil. Yield: 46%. ¹H NMR (CDCl₃, 300 MHz, mixture of two isomers): δ=10.28 (s, 1H), 6.97 (t, J=11.4 Hz, 2H), 4.33-4.12 (m, 3H), 3.65-3.55 (m, 2H), 2.10-2.01 (m, 7H). ¹³C NMR (CDCl₃, 75.5 MHz, mixture of two isomers): δ=183.5, 170.7 (d, J=7.3 Hz), 163.6 (dd, J=262.5, 8.6 Hz), 157.0, 150.8 (d, J=14.6 Hz), 112.6, 106.2 (d, J=25.0 Hz), 64.4, 63.8, 56.8, 56.4, 47.4, 47.3, 28.7, 27.8, 23.8, 22.9, 20.8.

Example 19 3-Fluoro-4-formylphenyl 2-oxooxazolidine-3-carboxylate

To a 2000 mL dry round bottom flask were added 2-fluoro-4-methoxybenzaldehyde (25.0 g, 162.2 mmol), anhydrous AlCl₃ (64.8 g, 486.8 mmol) and anhydrous CH₂Cl₂ (1000 mL). The mixture was stirred and refluxed for 3 days. The reaction mixture was cooled in an ice-water bath, then ice (100 g) was added very carefully into the reaction mixture to quench the excess AlCl₃. Another 800 mL of cold water was added. The organic layer was separated, and the aqueous solution was extracted with MTBE (300 mL×2). The combined organic layer was concentrated, and the residual solid was dissolved in 400 mL of cold 2N aqueous NaOH and 200 mL of water. The resulting aqueous solution was extracted with MTBE (200 mL×2). The basic aqueous solution then was acidified with concentrated HCl. After filtration and drying, 2-fluoro-4-hydroxybenzaldehyde (21.5 g) was obtained as a white solid. Yield: 95%. ¹H NMR (Acetone-d₆, 300 MHz): δ=10.12 (s, 1H), 9.87 (s, 1H), 7.74 (t, J=8.4 Hz, 1H), 6.83 (dd, J=8.4, 1.8 Hz, 1H), 7.70 (dd, J=12.3, 2.1 Hz, 1H).

To a 250 mL dry round bottom flask were added 2-oxazolidinone (4.35 g, 50.0 mmol), triphosgene (5.49 g, 18.5 mmol) and anhydrous THF (100 mL). The mixture was stirred in an ice-water bath, then triethylamine (9.8 mL, 70.0 mmol) was added slowly. After stirring at 0° C. for 1 hour, the mixture was stirred continually at room temperature overnight. The reaction mixture was filtered and the filtrate was concentrated. The residue was dissolved in 10 mL of CH₂Cl₂, and this solution was added slowly to a stirring mixture of 2-fluoro-4-hydroxy-benzaldehyde (3.78 g, 27.0 mmol) and triethylamine (5.63 mL, 40.4 mmol) in 20 mL of anhydrous CH₂Cl₂ at 0° C. After stirring at room temperature for 2 days, water (80 mL) and MTBE (100 mL) were added to the reaction mixture. The mixture was filtered and the solid was washed with cold water (50 mL×2), followed by extraction using MTBE (50 mL×4). After drying, 3-fluoro-4-formylphenyl 2-oxooxazolidine-3-carboxylate (5.90 g) was obtained as a white solid. Yield: 86%. ¹H NMR (CDCl₃, 300 MHz): δ=10.42 (s, 1H), 8.03 (t, J=8.1 Hz, 1H), 7.27-7.23 (m, 2H), 4.61 (t, J=7.8 Hz, 2H), 4.29 (t, J=7.5 Hz, 2H). ¹³C NMR (CDCl₃, 75.5 MHz): δ=186.3 (d, J=6.0 Hz), 166.9, 155.0 (d, J=260 Hz), 130.2, 122.6, 118.3, 110.7 (d, J=24.4 Hz), 62.2, 43.9. ¹⁹F NMR (CDCl₃, 282.3 MHz): δ=−118.6.

Example 20 2-Formyl-4-methylphenyl 2-oxooxazolidine-3-carboxylate

To a 500 mL dry round bottom flask were added 2-oxazolidinone (9.13 g, 104.9 mmol), triphosgene (10.9 g, 36.7 mmol) and anhydrous THF (100 mL). The mixture was stirred in an ice-water bath, then triethylamine (15.8 mL, 115.4 mmol) was added slowly. The resulting mixture was stirred at room temperature overnight. The reaction mixture was filtered and the filtrate was concentrated. The residue was dissolved in 20 mL of CH₂Cl₂, and this solution was added slowly to a stirring mixture of 5-methylsalicylaldehyde (10.0 g, 73.4 mmol) and pyridine (8.5 mL, 104.9 mmol) in 30 mL of anhydrous CH₂Cl₂ at 0° C. After stirring at room temperature overnight, water (50 mL) and MTBE (100 mL) were added to the reaction mixture. The mixture was filtered and the solid was washed with cold water (20 mL×2), followed by MTBE (20 mL×2). After drying, 2-formyl-4-methylphenyl 2-oxooxazolidine-3-carboxylate (13.3 g) was obtained as a white solid. Yield: 73%. ¹H NMR (Acetone-d₆, 300 MHz): δ=10.25 (s, 1H), 7.78 (s, 1H), 7.62 (d, J=8.1 Hz, 1H), 7.35 (d, J=8.4 Hz, 1H), 4.58 (t, J=7.8 Hz, 2H), 4.32 (t, J=7.5 Hz, 2H), 2.47 (s, 3H).

Example 21 2-(((4-Formylphenoxy)carbonyl)(methyl)amino)ethyl acetate

The synthesis of 2-(benzyl(methyl)amino)ethanol as depicted in the above scheme followed the procedures disclosed in Jones, G. C.; Hauser, C. R. J. Org. Chem. 1962, 27, 802.

To a 500 mL dry round bottom flask were added 2-(benzyl(methyl)amino)ethanol (46.3 g, 280.2 mmol), triethylamine (150 mL, 1.08 mol), acetic anhydride (31.8 mL, 336.2 mmol), anhydrous CH₂Cl₂ (100 mL) and a crystal piece of DMAP (4-Dimethylaminopyridine). The mixture was stirred at room temperature for 3 hours. MTBE (700 mL) was added into the reaction mixture, and this mixture was washed, respectively, with cold 2N NaOH (150 mL), water (100 mL), brine (150 mL). The MTBE layer was concentrated, and the residue was poured onto a silica gel pad (200.0 g). The pad was eluted with a co-solvents of ethyl acetate: heptane=3:1 to give 2-(benzyl(methyl)amino)ethyl acetate (50.8 g) as a yellow oil. Yield: 87%. ¹H NMR (CDCl₃, 300 MHz): δ=7.41-7.25 (m, 5H), 4.29 (t, J=6.3 Hz, 2H), 3.65 (s, 2H), 2.74 (t, J=6.0 Hz, 2H), 2.38 (s, 3H), 2.14 (s, 3H). ¹³C NMR (CDCl₃, 75.5 MHz): δ=170.9, 138.7, 128.9, 128.2, 127.1, 62.5, 62.2, 55.3, 42.6, 21.0.

To a 1000 mL dry round bottom flask were added triphosgene (24.2 g, 81.5 mmol) and anhydrous CH₂Cl₂ (500 mL). The mixture was stirred in a dry ice-acetone bath, then a solution of 2-(benzyl(methyl)amino)ethyl acetate (50.7 g, 244.6 mmol) in 150 mL of anhydrous CH₂Cl₂ was added slowly. After the addition, the resulting mixture was cooled in an ice-water bath, then warmed slowly to room temperature, followed being stirred at room temperature overnight. After removal of the volatile materials, the residue was purified with a silica gel chromatography (heptane/ethyl acetate, gradient eluting) to give 2-(chlorocarbonyl(methyl)amino)ethyl acetate (40.2 g) as a yellow oil. Yield: 92%. ¹H NMR (CDCl₃, 300 MHz, mixture of two isomers): isomer 1: δ=4.27 (t, J=5.7 Hz, 2H), 3.76 (t, J=5.7 Hz, 2H), 3.10 (s, 3H), 2.09 (s, 3H); isomer 2: δ=4.26 (t, J=5.1 Hz, 2H), 3.66 (t, J=5.1 Hz, 2H), 3.20 (s, 3H), 2.07 (s, 3H). ¹³C NMR (CDCl₃, 75.5 MHz, mixture of two isomers): δ=170.5, 149.9, 149.0, 61.2, 61.1, 51.4, 50.0, 39.4, 37.4, 20.7.

To a 250 mL dry round bottom flask were added sodium hydride (2.08 g, 60%, 52 mmol), anhydrous THF (40 mL) and 4-hydroxybenzaldehyde (4.88 g, 40.0 mmol). The resulting mixture was stirred at room temperature for 1 hour. To this mixture, a solution of 2-(chloro-carbonyl(methyl)amino)ethyl acetate (8.98 g, 50 mmol) in 10 mL of anhydrous CH₂Cl₂ was added. The resulting mixture was stirred at room temperature overnight. The volatile materials were removed, then cold water (100 mL) was added to the residue. The aqueous solution was extracted with CH₂Cl₂ (60 mL×4). The combined CH₂Cl₂ solution was dried over Na₂SO₄. After removal of the solvent, the residue was purified with a silica gel chromatography (heptane/ethyl acetate, gradient eluting) to give 2-(((4-formylphenoxy)carbonyl)(methyl)amino)ethyl acetate (10.4 g) as a colorless oil. Yield: 98%. ¹H NMR (CDCl₃, 300 MHz, mixture of two isomers), isomer 1: δ=9.92 (s, 1H), 7.85 (d, J=8.4 Hz, 2H), 7.27 (d, J=8.4 Hz, 2H), 4.26 (t, J=5.4 Hz, 2H), 3.66 (t, J=5.4 Hz, 2H), 3.12 (s, 3H), 2.03 (s, 3H); isomer 2: δ=9.92 (s, 1H), 7.85 (d, J=8.4 Hz, 2H), 7.27 (d, J=8.4 Hz, 2H), 4.24 (t, J=5.1 Hz, 2H), 3.57 (t, J=5.1 Hz, 2H), 3.02 (s, 3H), 2.01 (s, 3H). ¹³C NMR (CDCl₃, 75.5 MHz, mixture of two isomers): δ=190.7, 170.5, 170.4, 156.0, 155.9, 153.6, 153.2, 133.2, 130.8, 130.7, 61.6, 61.5, 48.3, 47.9, 35.5, 20.5.

Example 22 2,2′-((4-formylphenoxy)carbonylazanediyl)bis(ethane-2,1-diyl) diacetate

The synthesis of 2,2′-benzylazanediyl-bis-ethanol as depicted in the above scheme followed procedures disclosed in Shen, Y.; Feng, X.; Li, Y.; Zhang, G.; Jiang, Y. Tetrahedron 2003, 59, 5667.

To a 500 mL dry round bottom flask were added 2,2′-benzylazanediyl-bis-ethanol (45.2 g, 231.0 mmol), triethylamine (200 mL), acetic anhydride (52.4 mL, 554.4 mmol), anhydrous CH₂Cl₂ (100 mL) and a crystal piece of DMAP. The mixture was stirred in an ice-water bath for 1 hour, then at room temperature for 2 hours. Most volatile materials were evaporated, then MTBE (700 mL) was added into the residue, and this mixture was washed, respectively, with water (100 mL), cold 2N NaOH (200 mL), water (150 mL), brine (100 mL). The MTBE layer was concentrated, and the residue was poured onto a silica gel pad (200.0 g). The pad was eluted with a co-solvents of ethyl acetate:heptane (1:1) to give 2,2′-(benzy-lazanediyl)bis(ethane-2,1-diyl)diacetate (53.0 g) as a yellow oil. Yield: 82%. ¹H NMR (CDCl₃, 300 MHz): δ=7.38-7.25 (m, 5H), 4.20 (t, J=6.3 Hz, 4H), 3.77 (s, 2H), 2.86 (t, J=6.3 Hz, 4H), 2.09 (s, 6H). ¹³C NMR (CDCl₃, 75.5 MHz): δ=170.7, 139.0, 128.6, 128.2, 127.0, 62.4, 59.2, 52.5, 20.8.

To a 1000 mL dry round bottom flask were added triphosgene (18.8 g, 63.2 mmol) and anhydrous CH₂Cl₂ (500 mL). The mixture was stirred in a dry ice-acetone bath, then a solution of 2,2′-(benzylazanediyl)bis(ethane-2,1-diyl) diacetate (53.0 g, 189.7 mmol) in 100 mL of anhydrous CH₂Cl₂ was added slowly. After the addition, the resulting mixture was cooled in an ice-water bath, then warmed slowly to room temperature, followed being stirred at room temperature overnight. After removal of the volatile materials, the residue was purified with a silica gel chromatography (heptane/ethyl acetate, gradient eluting) to give 2,2′-(chlorocarbony-lazanediyl)bis(ethane-2,1-diyl) diacetate (45.7 g) as a yellow oil. Yield: 96%. ¹H NMR (CDCl₃, 300 MHz): δ=4.27 (t, J=5.7 Hz, 2H), 4.25 (t, J=5.4 Hz, 2H); 3.79 (t, J=5.7 Hz, 2H), 3.68 (t, J=5.4 Hz, 2H), 2.08 (s, 3H); 2.06 (s, 3H). ¹³C NMR (CDCl₃, 75.5 MHz): δ=170.5, 149.4, 61.5, 61.0, 50.4, 49.1, 20.6.

To a 250 mL dry round bottom flask were added sodium hydride (2.08 g, 60%, 52 mmol), anhydrous THF (40 mL) and 4-hydroxybenzaldehyde (4.88 g, 40.0 mmol). The resulting mixture was stirred at room temperature for 1 hour. To this mixture, a solution of 2,2′-(chloro-carbonylazanediyl)bis(ethane-2,1-diyl) diacetate (12.6 g, 50 mmol) in 10 mL of anhydrous THF was added. The resulting mixture was stirred at room temperature overnight. The volatile materials were removed, then cold water (100 mL) was added to the residue. The aqueous solution was extracted with MTBE (50 mL×3). The combined MTBE solution was dried over Na₂SO₄. After removal of the solvent, the residue was purified with a silica gel chromatography (heptane/ethyl acetate, gradient eluting) to give 2,2′-((4-formylphenoxy)carbonylazanediyl)bis(ethane-2,1-diyl)diacetate (12.8 g) as a white solid. Yield: 95%. ¹H NMR (CDCl₃, 300 MHz): δ=9.88 (s, 1H), 7.83-7.79 (m, 2H), 7.25-7.22 (m, 2H), 4.25 (t, J=5.7 Hz, 2H), 4.20 (t, J=5.4 Hz, 2H), 3.66 (t, J=5.7 Hz, 2H), 3.56 (t, J=5.4 Hz, 2H), 1.98 (s, 3H), 1.96 (s, 3H). ¹³C NMR (CDCl₃, 75.5 MHz): δ=190.5, 170.3, 170.2, 155.7, 153.3, 133.5, 130.8, 62.0, 61.6, 47.6, 47.3, 20.4.

Section 2. Synthesis of Bisphosphonate Cyclic Acetals.

The bisphosphonate cyclic acetals were synthesized following the general procedures shown below for Risedronate cyclic acetal Example 26.

Example 25 tert-Butyl chlorobenzylcarbonate

The substituted benzaldehyde 23 was converted to tert-butyl chlorobenzylcarbonate 25 using the general procedures shown below.

To a dry 250 mL round bottom flask was added substituted benzaldehyde 23 (468 mg, 20.0 mmol), anhydrous THF (15 mL) and triphosgene (2.96 g, 10.0 mmol), and pyridine (0.79 mL, 0.63 mmol). The mixture was stirred for 1 hour at 40° C.-45° C. The completion of the reaction was monitored by ¹³C NMR, peak at δ=80-87 indicated the formation of carbonyl chloride 24. This reaction mixture was used in the next step without work-up and purification. To a solution of carbonyl chloride 24 in THF was added dichloromethane (10 ml) followed by drop-wise addition of ^(t)BuOH (25 mmol) and pyridine (25 mmol) at 0° C. The resulted mixture was stirred at 0° C. for 1.5 hours. The reaction mixture was diluted with MTBE (100 mL) and filtered through a pad of glass microfibre filter to remove the pyridine hydrochloride salt precipitated. The filtrate was collected and washed with ice cold water (100 mL) and the organic layer was dried over MgSO₄. The solvents were removed by evaporation to give the carbonate 25 (18 mmol) as a pale yellow oil. This oil was used for next step without further purification.

Example 26 Risedronate Cyclic Acetal

To a suspension of risedronate (8 mmol) in MeCN (10 mL) was added DIPEA (40 mmol) and the mixture was heated at 40° C. for 10 minutes. The resulting clear solution was cooled to room temperature and a solution of the carbonate 25 in MeCN (5 mL) was added under inert atmosphere. The mixture was then stirred at 40° C.-45° C. for 18 hours. The reaction mixture was then cooled to room temperature and evaporated to dryness. The residue obtained was purified by combi-flash system (120 g silica column, Isco or Silicycle) with gradient eluting by acetonitrile-MeOH (0-30%). The fractions containing cis and trans isomers of DIPEA-salt of the product were separately collected (monitored by ³¹P NMR). The earlier fractions contained trans-isomer (chemical shift of phosphorus in ³¹P NMR was in stronger field). Later fractions are cis-isomer (δ_(P)—in a weaker field). DIPEA-salt of the product was converted to a sodium-salt 26 in Na⁺ ion-exchange column (5 g of resin). Lyophilization of collected fractions afforded 0.4 mmol of trans-isomer, 0.3 mmol of cis-isomer, and 0.5 mmol of mixture cis/trans isomers. Mixture of isomers (Na-salt) are further separated by combi-flash chromatography (water-acetonitrile eluting system).

trans-Isomer: yield 200 mg (2.7%). ¹H NMR (D₂O, 300 MHz): δ=8.38 (s, 1H), 8.06 (d, 1H), 7.87 (d, J=9.9 Hz, 1H), 7.15 (m, 3H), 7.01 (t, 1H), 6.89 (t, 1H), 6.23 (t, 1H), 4.87 (m, 1H), 3.07 (t, 2H, J=16.2 Hz), 1.55-1.28 (m, 8H). ³¹P NMR (D₂O, 121.5 MHz): δ=15.835. MS (M-1) m/z: 498. Elemental analysis (%) calculated for C₂₀H₂₃N₁O₁₀P₂Na₂.2.5H₂O (587): C, 40.69; H, 4.78; N, 2.37. found: C, 40.57; H, 4.61; N, 2.47.

cis-Isomer Yield 150 mg (2%). ¹H NMR (D₂O, 300 MHz): δ=8.37 (s, 1H), 8.22 (d, 1H), 8.10 (d, J=8.1 Hz, 1H), 7.41-7.45 (m, 2H), 7.18 (t, 1H), 7.07 (t, 1H), 6.90 (d, J=8.1 Hz, 1H), 6.37 (t, 1H), 4.87 (m, 1H), 3.15 (t, 2H, J=12.6 Hz), 1.63-1.28 (m, 8H). ³¹P NMR (D₂O, 121.5 MHz): δ=15.338. MS (M-1) m/z: 498. Elemental analysis (%) calculated for C₂₀H₂₃N₁O₁₀P₂Na₂.2.5H₂O.0.1CH₃CN (591.1): C, 37.84; H, 4.45; N, 2.40. found: C, 37.59; H, 4.75; N, 2.75.

Example 27

Example 27 was synthesized following the general synthetic procedures of Example 26 starting from 3-methoxybenzaldehyde.

Yield: 405 mg (17%). Elemental analysis (%) calculated for C₁₅H₁₇N₁O₈P₂.0.9NaCl.1.9NH₄Cl (555.49): C, 32.43; H, 4.46; N, 7.31. found: C, 32.50; H, 4.13; N, 7.26. ESI MS (H₂O) m/z 400 (M⁺-1). ¹H NMR (D₂O, 300 MHz): δ=8.80-8.45 (m, 3H), 7.95-7.05 (m, 5H), 5.95 (m, 1H), 3.90 (s, 3H), 3.60-3.45 (m, 2H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.2, 16.0.

Example 28

Example 28 was synthesized following the general synthetic procedures of Example 26 starting from 4-formylphenyl acetate.

Yield 0.720 g (22%) as white powder, mixture of cis (55%) and trans (45%) isomers, contaminated with Risedronate (16%). ¹H NMR (D₂O): δ=8.75 (s, 0.45H-trans), 8.61 (s, 0.55H-cis), 8.44 (m, 1H-trans,cis), 8.36 (d, J=7.8, 0.45H-trans), 8.21 (d, J=7.8 Hz, 0.55H-cis), 7.63 (d, J=8.9 Hz for AB-system, 1.1H-cis), 7.61 (m, 1H, trans, cis), 7.29 (d, J=8.5 Hz for AB-system, 0.9H-trans), 7.18 (d, J=8.9 Hz for AB-system, 1.1H-cis), 7.11 (d, J=8.5 Hz for AB-system, 0.9H-trans), 6.55 (t, 0.55H, cis), 6.41 (t, 0.45H, trans), 3.40 (m, J=16.5 Hz-trans, 2H-trans, cis), 2.3 (s, 3H). ³¹P NMR (D₂O): δ=16.55-cis, 16.29-trans. LC-MS (ESI) for C₁₆H₁₇NO₉P₂ m/z 428 [M-H]⁻ Calc. for 0.84C₁₆H₁₅NNa₂O₉P₂.0.16C₇H₇NNa₄O₇P₂.2.5H₂O (%): C, 34.84; H, 3.76; N, 2.79. found (%): C, 34.36; H, 3.46; N, 2.78.

Example 29

Example 29 was synthesized following the general synthetic procedures of Example 26 starting from 4-formylphenyl butyrate.

cis-Isomer: yield 0.63 g (18%). ¹H NMR (D₂O): δ=8.64 (s, 1H), 8.50 (d, J=5.7 Hz, 1H), 8.16 (d, J=7.5 Hz, 1H), 7.70 (d, J=9.0 Hz for AB-system, 2H), 7.59 (dd, J=5.7, 7.5 Hz, 1H), 7.24 (d, J=9.0 Hz for AB-system, 2H), 6.62 (t, J=4.9 Hz, 1H), 3.45 (t, J=12.4 Hz, 2H), 2.66 (t, J=7.2 Hz, 2H), 1.77 (m, J=7.2 Hz, 2H), 1.03 (t, J=7.2 Hz, 3H). ³¹P NMR (D₂O): δ=16.68. LC-MS (ESI) for C₁₈H₂₁NO₉P₂ m/z 456 [M-H]⁻ Calc. for C₁₈H₁₉NNa₂O₉P₂.3H₂O (%): C, 38.93; H, 4.54; N, 2.52. found (%): C, 38.62; H, 4.12; N, 2.64.

trans-Isomer: yield 0.647 g (18%). ¹H NMR (D₂O): δ=8.79 (s, 1H), 8.46 (d, J=4.8 Hz, 1H), 8.32 (d, J=8.1 Hz, 1H), 7.56 (t, J=5.7 Hz, 1H), 7.33 (d, J=8.5 Hz for AB-system, 2H), 7.17 (d, J=8.5 Hz for AB-system, 2H), 6.48 (t, J=4.8 Hz, 1H), 3.45 (t, J=16.5 Hz, 2H), 2.67 (t, J=7.2 Hz, 2H), 1.78 (m, J=7.2 Hz, 2H), 1.04 (t, J=7.2 Hz, 3H). ³¹P NMR (D₂O): δ=16.40. LC-MS (ESI) for C₁₈H₂₁NO₉P₂ m/z 456 [M-H]⁻ Calc. for C₁₈H₁₉NNa₂O₉P₂.1.5H₂O.1NaCl(%): C, 36.85; H, 3.78; N, 2.39. found (%): C, 36.98; H, 3.90; N, 2.53.

Example 30

Example 30 was synthesized following the general synthetic procedures of Example 26 starting from 2-fluoro-4-formylphenyl butyrate.

Yield: 0.18 g (3%). Elemental analysis (%) calculated for C₁₈H₁₈FNNa₂O₉P₂.1.5NaCl.2H₂O (606.97): C, 33.62; H, 3.45; N, 2.18. found C, 33.45; H, 3.21; N, 2.29. ESI MS (CH₃CN): m/z 474 (100), 475 (15), calculated m/z 475.31. ¹H NMR (D₂O, 300 MHz): δ=0.98 (t, 3H, J=7.2 Hz), 1.91 (q, 2H, J=7.2 Hz), 2.65 (t, 2H, J=7.2 Hz), 3.44 (t, 2H, J=12.3 Hz), 6.53 (m, 1H), 7.26 (m, 1H), 7.48 (m, 1H), 7.50 (d, 2H, J=10.5 Hz), 7.71 (m, 1H), 8.32 (m, 1H), 8.52 (m, 1H), 8.65 (m, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.46. ¹⁹F NMR (D₂O, 282 MHz): δ=−128.75.

Example 31

Example 31 was synthesized following the general synthetic procedures of Example 26 starting from 4-formylphenyl octanoate (Example 1).

Yield: 725 mg (26%); elemental analysis (%) calculated for C₂₂H₂₇N₁Na₂O₉P₂.0.70NaCl.1.0H₂O (616.34): C, 42.87; H, 4.74; N, 2.27. found: C, 42.91; H, 4.87; N, 2.21. ESI MS (H₂O): m/z: 512 (M⁺-1). ¹H NMR (D₂O, 300 MHz): δ=8.60-6.80 (m, 8H), 6.62-6.38 (m, 1H), 3.58-3.24 (m, 2H), 2.42 (t, 2H), 1.76-0.82 (m, 13H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.5, 16.0.

Example 32

Example 32 was synthesized following the general synthetic procedures of Example 26 starting from 2-fluoro-4-methoxybenzaldehyde.

trans-Isomer: yield 1.0 g (20%). Elemental analysis (%) calculated for C₁₅H₁₄FNNa₂O₈P₂.0.3NaCl.2.3H₂O (522.19): C, 34.50; H, 3.59; N, 2.68. found C, 34.40; H, 3.41; N, 2.80. ESI MS (CH₃CN): m/z 418 (100), 419 (80), 420 (10) calculated m/z 419.24. ¹H NMR (D₂O, 300 MHz): δ=3.39 (t, 2H, J=8.7 Hz), 3.79 (s, 1H), 6.73 (m, 2H), 6.78 (m, 1H), 7.52 (m, 1H), 7.60 (m, 2H), 8.10 (s, 1H), 8.42 (m, 1H), 8.57 (m, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.57. ¹⁹F NMR (D₂O, 282 MHz): δ=−121.84.

cis-Isomer, yield: 1.5 g (31%). Elemental analysis (%) calculated for C₁₅H₁₄FNNa₂O₈P₂.0.4NaCl.2H₂O (504.62): C, 35.70; H, 3.20; N, 2.78. found C, 35.52; H, 3.23; N, 2.83. ESI MS (CH₃CN): m/z 418 (100), 419 (8), calculated m/z 419.24. ¹H NMR (D₂O, 300 MHz): δ=3.43 (t, 2H, J=15.6 Hz), 3.76 (s, 3H), 6.58 (m, 1H), 6.71 (m, 3H), 6.89 (m, 1H), 7.48 (m, 2H), 8.24 (m, 1H), 8.40 (m, 1H), 8.73 (m, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.36. ¹⁹F NMR (D₂O, 282 MHz): δ=−121.23.

Example 33

Example 33 was synthesized following the general synthetic procedures of Example 26 starting from 4-formylphenyl isobutyrate.

trans-Isomer, yield: 0.9 g (17%). Elemental analysis (%) calculated for C₁₅H₁₄FNNa₂O₈P₂.0.8NaCl.0.2H₂O (546.40): C, 39.57; H, 3.80; N, 2.56. found C, 39.29; H, 4.10; N, 2.76. ESI MS (CH₃CN): m/z 456 (100), 457 (22) calculated m/z 457.32. ¹H NMR (D₂O, 300 MHz): δ=1.25 (d, 6H, J=6 Hz), 2.88 (sept, 1H, J=6 Hz), 3.37 (t, 2H, J=8.7 Hz), 3.79 (s, 1H), 6.41 (m, 1H), 7.10 (m, 1H), 7.25 (m, 2H), 7.50 (m, 1H), 8.25 (s, 1H), 8.40 (m, 1H) 8.61 (m, 1H), 8.72 (m, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.41. cis-Isomer, yield: 0.9 g (15.5%). Elemental analysis (%) calculated for C₁₈H₁₉NNa₂O₉P₂.0.9NaCl.2.1H₂O (610.74): C, 35.40; H, 3.83; N, 2.29. found C, 35.24; H, 3.53; N, 2.44. ESI MS (CH₃CN): m/z 456 (100), 457 (30), calculated m/z 457.32. ¹H NMR (D₂O, 300 MHz): δ=1.27 (d, 6H, J=6 Hz), 2.87 (sept., 1H, J=6 Hz), 3.41 (t, 2H, J=10.8 Hz), 6.57 (m, 1H), 7.10 (m, 1H), 7.18 (d, 1H, J=7.8 Hz), 7.54 (m, 1H), 7.65 (d, 1H, J=9.0 Hz), 8.09 (m, 1H), 8.43 (m, 1H), 8.59 (m, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.70.

Example 34

Example 34 was synthesized following the general synthetic procedures of Example 26 starting from 2-fluoro-5-methoxybenzaldehyde.

trans-Isomer yield: 1.25 g (24%). Elemental analysis (%) calculated for C₁₅H₁₄FNNa₂O₈P₂.0.3NaCl.2.3H₂O (522.19): C, 29.85; H, 3.21; N, 2.32. found C, 29.84; H, 2.91; N, 2.40. ESI MS (CH₃CN): m/z 418 (100), 419 (20), 420 (1) calculated m/z 419.24. ¹H NMR (D₂O, 300 MHz): δ=3.37 (t, 2H, J=17.2 Hz), 3.74 (s, 1H), 6.58 (m, 1H), 6.91 (m, 1H), 7.00 (m, 2H), 7.54 (d, 1H, J=5.4 Hz), 8.30 (d, 1H, J=8.1 Hz), 8.40 (d, 1H, J=7.5 Hz), 8.73 (s, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.38. ¹⁹F NMR (D₂O, 282 MHz): δ=−130.08.

Example 35

Example 35 was synthesized following the general synthetic procedures of Example 26 starting from 3-formylphenyl butyrate (Example 4).

Yield: 215 mg (11%). Elemental analysis (%) calculated for C₁₈H₁₉N₁Na₂O₉P₂.1.10NaCl.2.0H₂O (601.63): C, 35.94; H, 3.85; N, 2.33. found: C, 35.80; H, 3.83; N, 2.28. ESI MS (H₂O): m/z: 456 (M⁺-1). ¹H NMR (D₂O, 300 MHz): δ=8.72-7.05 (m, 8H), 6.56-6.32 (m, 1H), 3.42-3.22 (m, 2H), 2.60 (m, 2H), 1.74 (m, 2H), 0.96 (m, 3H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.8, 16.4.

Example 36

Example 36 was synthesized following the general synthetic procedures of Example 26 starting from ethyl 4-formylphenyl carbonate (Example 5).

Yield: 215 mg (9%); elemental analysis (%) calculated for C₁₇H₁₇N₁Na₂O₁₀P₂.0.9NaCl.0.8H₂O (570.29): C, 35.80; H, 3.29; N, 2.46. found: C, 35.86; H, 3.29; N, 2.54. ESI MS (H₂O): m/z: 458 (M⁺-1). ¹H NMR (D₂O, 300 MHz): δ=8.62-7.21 (m, 8H), 6.60-6.52 (m, 1H), 4.36-4.24 (m, 2H), 3.46-3.26 (m, 2H), 1.36-1.28 (m, 3H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.7.

Example 37

Example 37 was synthesized following the general synthetic procedures of Example 26 starting from 4-formylphenyl 3-methylbutanoate.

cis-Isomer, yield: 0.31 g (5.0%). Elemental analysis (%) calculated for C₁₉H₂₁NNa₂O₉P₂.1.1NaCl.2.4H₂O (622.86): C, 36.64; H, 4.17; N, 2.25. found C, 36.64; H, 3.87; N, 2.33. ESI MS (CH₃CN): m/z 470 (100), 471 (20) calculated m/z 471.34. ¹H NMR (D₂O, 300 MHz): δ=1.00 (d, 6H, J=6.0 Hz), 2.13 (m, 1H, J=6.6 Hz), 2.5 (m, 2H), 3.37 (t, 2H, J=12.1 Hz), 6.55 (t, 1H, J=4.3 Hz), 7.17 (m, 1H), 7.48 (m, 2H), 7.62 (m, 2H), 8.03 (m, 1H), 8.39 (s, 1H), 8.55 (s, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.72.

Example 38

Example 38 was synthesized following the general synthetic procedures of Example 26 starting from 4-formylphenyl tetrahydro-2H-pyran-4-carboxylate (Example 6).

Yield: 385 mg (14%); elemental analysis (%) calculated for C₂₀H₂₁N₁Na₂O₁₀P₂.0.8NaCl.1.6H₂O (618.92): C, 38.81; H, 3.94; N, 2.26. found: C, 38.79; H, 4.15; N, 2.45. ESI MS (H₂O) m/z 498 (M⁺-1). ¹H NMR (D₂O, 300 MHz): δ=8.88-7.16 (m, 8H), 6.62-6.50 (m, 1H), 4.06-4.02 (m, 2H), 3.63-3.49 (m, 4H), 2.98 (m, 1H), 2.07-1.81 (m, 4H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.0, 15.9.

Example 39

Example 39 was synthesized following the general synthetic procedures of Example 26 starting from 2,6-difluoro-4-methoxybenzaldehyde.

Yield: 256 mg (11%); elemental analysis (%) calculated for C₁₅H₁₃F₂N₁Na₂O₈P₂.1.2NaCl.0.5H₂O (560.36): C, 32.15; H, 2.52; N, 2.50. found: C, 32.04; H, 2.52; N, 2.53. ESI MS (H₂O) m/z 436 (M⁺-1). ¹H NMR (D₂O, 300 MHz): δ=8.72-7.40 (m, 4H), 6.82-6.52 (m, 3H), 3.80 (s, 3H), 3.42-3.26 (m, 2H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.6. ¹⁹F NMR (CDCl₃, 282.3 MHz): δ=−113.

Example 40

Example 40 was synthesized following the general synthetic procedures of Example 26 starting from 4-formylphenyl morpholine-4-carboxylate (Example 7).

Yield: 342 mg (13%); elemental analysis (%) calculated for C₁₉H₂₀N₂Na₂O₁₀P₂.1.0NaCl.1.0H₂O (620.79): C, 36.76; H, 3.57; N, 4.51. found: C, 36.89; H, 3.50; N, 4.48. ESI MS (H₂O) m/z 499 (Mt 1). ¹H NMR (D₂O, 300 MHz): δ=8.58-7.16 (m, 8H), 6.56 (m, 1H), 3.80-3.45 (m, 8H), 3.43-3.28 (m, 2H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.8, 16.5.

Example 41

Example 41 was synthesized following the general synthetic procedures of Example 26 starting from 2,2′-((4-formylphenoxy)carbonylazanediyl)bis(ethane-2,1-diyl) diacetate (Example 22).

trans-Isomer, yield: 677 mg (15%). Elemental analysis (%) calculated for C₂₃H₂₆N₂Na₂O₁₃P₂.0.8H₂O (660.82): C, 41.80; H, 4.21; N, 4.24. found: C, 41.76; H, 4.30; N, 4.03. ESI MS (H₂O) m/z 601 (M⁺-1). ¹H NMR (D₂O, 300 MHz): δ=8.64-7.03 (m, 8H), 6.40-6.28 (m, 1H), 4.27-4.22 (m, 4H), 3.69-3.56 (m, 4H), 3.30 (t, J=16.5 Hz, 2H), 1.99 (s, 6H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.5.

cis-Isomer, yield: 294 mg (7%). Elemental analysis (%) calculated for C₂₃H₂₆N₂Na₂O₁₃P₂.0.5 NaCl.1.2H₂O (697.26): C, 39.62; H, 4.11; N, 4.02. found: C, 39.51; H, 4.11; N, 4.02. ESI MS (H₂O): m/z: 601 (M⁺-1). ¹H NMR (D₂O, 300 MHz): δ=8.60-7.10 (m, 8H), 6.58 (br, 1H), 4.29 (br, 4H), 3.75-3.62 (m, 4H), 3.39 (br, 2H), 2.06 (s, 6H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.8.

Example 42

Example 42 was synthesized following the general synthetic procedures of Example 26 starting from 4-formylphenyl 3-methylbut-2-enoate.

Yield: 0.12 g (2%). Elemental analysis (%) calculated for C₁₉H₁₉NNa₂O₉P₂.0.5NaCl.2.2H₂O (582.17): C, 39.20; H, 4.05; N, 2.41. found C, 39.00; H, 3.88; N, 2.73. ESI MS (CH₃CN): m/z 468 (100), 469 (20) calculated m/z 469.33. ¹H NMR (D₂O, 300 MHz): δ=1.97 (m, 3H), 2.13 (m, 1H), 3.36 (t, 2H, J=16.6 Hz), 5.96 (s, 1H), 6.41 (t, 1H, J=4.5 Hz), 7.09 (m, 2H), 7.24 (m, 2H), 7.45 (m, 1H), 8.21 (m, 1H), 8.38 (m, 1H), 8.71 (s, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.43.

Example 43

Example 43 was synthesized following the general synthetic procedures of Example 26 starting from 4-formylphenyl cyclopropanecarboxylate.

trans-Isomer, yield: 0.11 g (2.1%). Elemental analysis (%) calculated for C₁₈H₁₇NNa₂O₉P₂.0.05NaCl.1.3H₂O (525.62): C, 41.13; H, 3.76; N, 2.66. found C, 41.17; H, 3.84; N, 2.70. ESI MS (CH₃CN): m/z 454 (100), 455 (30) calculated m/z 455.30. ¹H NMR (D₂O, 300 MHz): δ=1.09 (m, 4H), 1.89 (m, 1H), 3.33 (t, 2H, J=17.1 Hz), 6.37 (t, 1H, J=4.8 Hz), 7.08 (m, 2H), 7.17 (m, 2H), 7.34 (m, 1H), 8.09 (m, 1H, J=7.8 Hz), 8.33 (d, 1H, J=5.4 Hz), 8.67 (s, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.57.

cis-Isomer, yield: 0.12 g (2.3%). Elemental analysis (%) calculated for C₁₈H₁₇NNa₂O₉P₂.0.2NaCl.2.4H₂O (525.62): C, 41.13; H, 3.76; N, 2.66. found C, 38.93; H, 3.68; N, 2.64. ESI MS (CH₃CN): m/z 454 (100), 455 (20) calculated m/z 455.30. ¹H NMR (D₂O, 300 MHz): δ=1.11 (m, 4H), 1.91 (m, 1H), 3.38 (t, 2H, J=12.6 Hz), 6.56 (t, 1H, J=4.4 Hz), 7.18 (m, 2H), 7.44 (m, 1H), 7.63 (d, 2H, J=7.8 Hz), 8.00 (m, 1H, J=7.8 Hz), 8.39 (m, 1H), 8.54 (s, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=14.65.

Example 44

Example 44 was synthesized following the general synthetic procedures of Example 26 starting from 2-fluoro-4-formylphenyl cyclopropanecarboxylate.

trans-Isomer, yield: 0.14 g (2.6%). Elemental analysis (%) calculated for C₁₈H₁₆FNNa₂O₉P₂.0.2NaCl.1.3H₂O (552.38): C, 41.80; H, 3.12; N, 2.71. found C, 39.39; H, 3.71; N, 2.71. ESI MS (CH₃CN): m/z 472 (100), 473 (20) calculated m/z 473.29. ¹H NMR (D₂O, 300 MHz): δ=1.14 (m, 4H), 1.94 (m, 1H), 3.32 (t, 2H, J=17.5 Hz), 6.35 (t, 1H, J=4.5 Hz), 7.04 (m, 2H), 7.17 (t, 1H, J=8.1 Hz), 7.35 (m, 1H), 8.08 (m, 1H, J=7.5 Hz), 8.33 (d, 1H, J=4.5 Hz), 8.67 (s, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.45. ¹⁹F NMR (D₂O, 282 MHz): δ=−129.18.

cis-Isomer, yield: 0.06 g (1.2%). Elemental analysis (%) calculated for C₁₈H₁₆FNNa₂O₉P₂.0.8NaCl.1.8H₂O (525.62): C, 41.80; H, 3.12; N, 2.71. found C, 35.99; H, 3.36; N, 2.68. ESI MS (CH₃CN): m/z 472 (100), 473 (30) calculated m/z 473.29. ¹H NMR (D₂O, 300 MHz): δ=1.14 (m, 4H), 1.94 (m, 1H), 3.34 (t, 2H, J=12.6 Hz), 6.52 (t, 1H, J=3.3 Hz), 7.18 (m, 2H), 7.44 (m, 1H), 7.63 (d, 2H, J=7.8 Hz), 8.00 (m, 1H, J=7.8 Hz), 8.39 (m, 1H), 8.54 (s, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=14.87. ¹⁹F NMR (D₂O, 282 MHz): S=−129.13.

Example 45

Example 45 was synthesized following the general synthetic procedures of Example 26 starting from 2-fluoro-4-formylphenyl morpholine-4-carboxylate (Example 8).

trans-Isomer, yield: 203 mg (7%); elemental analysis (%) calculated for C₁₉H₁₉F₁N₂Na₂O₁₀P₂.0.2NaCl.1.0H₂O (592.02): C, 38.55; H, 3.58; N, 4.73. found: C, 38.44; H, 3.61; N, 4.50; ESI MS (H₂O): m/z: 517 (M⁺-1). ¹H NMR (D₂O, 300 MHz): δ=8.67-6.93 (m, 8H), 6.35 (t, J=4.5 Hz, 1H), 3.75-3.50 (m, 8H), 3.32 (t, J=17.4 Hz, 2H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.5. ¹⁹F NMR (CDCl₃, 282.3 MHz): S=−130.0.

cis-Isomer, yield: 298 mg (11%); elemental analysis (%) calculated for C₁₉H₁₉F₁N₂Na₂O₁₀P₂.2.2NaCl.1.2H₂O (712.53): C, 32.03; H, 3.03; N, 3.93. found: C, 31.92; H, 3.06; N, 3.88; ESI MS (H₂O): m/z: 517 (M⁺-1). ¹H NMR (D₂O, 300 MHz): δ=8.52-7.25 (m, 8H), 6.54 (t, J=5.4 Hz, 1H), 3.77-3.53 (m, 8H), 3.37 (t, J=12.6 Hz, 2H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.8. ¹⁹F NMR (CDCl₃, 282.3 MHz): S=−129.9.

Example 46

Example 46 was synthesized following the general synthetic procedures of Example 26 starting from 4-formylphenyl cyclobutanecarboxylate.

cis-Isomer: yield 0.581 g (26%), contaminated with Risedronate (6%). ¹H NMR (D₂O): δ=8.64 (s, 1H), 8.50 (d, J=4.5 Hz, 1H), 8.18 (d, J=8.2 Hz, 1H), 7.69 (d, J=8.4 Hz for AB-system, 2H), 7.60 (dd, J=4.5, 8.2 Hz, 1H), 7.22 (d, J=8.4 Hz for AB-system, 2H), 6.61 (t, J=5.1 Hz, 1H), 3.53 (m, 1H), 3.46 (t, J=12.5 Hz, 2H), 2.38 (m, 4H), 2.20-1.88 (m, 2H). ³¹P NMR (D₂O): δ=16.64. Calc. for 0.94C₁₉H₁₉NNa₂O₉P₂.0.06C₇H₇NNa₄O₇P₂.0.5H₂O.0.5NaCl (%): C, 40.43; H, 3.58; N, 2.58. found (%): C, 40.31; H, 3.65; N, 2.93.

trans-Isomer: yield 0.596 g (27%), contaminated with Risedronate (9.6%). ¹H NMR (D₂O): δ=8.77 (s, 1H), 8.44 (d, J=5.0 Hz, 1H), 8.26 (d, J=8.0 Hz, 1H), 7.51 (dd, J=5.0, 8.0 Hz, 1H), 7.31 (d, J=8.5 Hz for AB-system, 2H), 7.15 (d, J=8.5 Hz for AB-system, 2H), 6.46 (t, J=4.95 Hz, 1H), 3.52 (m, 1H), 3.42 (t, J=17.0 Hz, 2H), 2.37 (m, 4H), 2.18-1.88 (m, 2H). ³¹P NMR (D₂O): δ=16.42. Calc. for 0.9C₁₉H₁₉NNa₂O₉P₂.0.1C₇H₇NNa₄O₇P₂.0.5H₂O (%): C, 42.14; H, 3.73; N, 2.75. found (%): C, 41.85; H, 3.97; N, 2.37.

Example 47

Example 47 was synthesized following the general synthetic procedures of Example 26 starting from 2-fluoro-4-formylphenyl 3-methylbut-2-enoate.

trans-Isomer, yield: 0.26 g (4.5%). Elemental analysis (%) calculated for C₁₉H₁₈FNNa₂O₉P₂.0.02NaCl.0.45H₂O (582.17): C, 42.34; H, 3.55; N, 2.83. found C, 42.61; H, 4.19; N, 2.53. ESI MS (CH₃CN): m/z 486 (100), 487 (35) calculated m/z 487.32. ¹H NMR (D₂O, 300 MHz): δ=1.95 (m, 3H), 2.19 (m, 1H), 3.33 (t, 2H, J=17.4 Hz), 5.95 (s, 1H), 6.36 (t, 1H, J=4.8 Hz), 6.95 (m, 1H), 7.09 (m, 1H), 7.18 (m, 1H), 7.33 (m, 1H), 8.08 (m, 1H, J=7.8 Hz), 8.33 (d, 1H, J=4.5 Hz), 8.68 (s, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.24. ¹⁹F NMR (D₂O, 282 MHz): δ=−128.84.

cis-Isomer, yield: 0.11 g (1.9%). Elemental analysis (%) calculated for C₁₉H₁₈FNNa₂O₉P₂.0.04NaCl.2.8H₂O (584.08): C, 39.07; H, 4.07; N, 2.40. found C, 38.80; H, 3.77; N, 2.44. ESI MS (CH₃CN): m/z 486 (100), 487 (23) calculated m/z 487.32. ¹H NMR (D₂O, 300 MHz): δ=1.98 (s, 3H), 2.14 (s, 3H), 3.37 (t, 2H, J=12.5 Hz), 5.99 (s, 1H), 6.53 (t, 1H, J=4.4 Hz), 7.10 (m, 1H), 7.25 (m, 1H), 7.51 (m, 2H), 8.10 (m, 1H), 8.44 (m, 1H), 8.58 (s, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.58. ¹⁹F NMR (D₂O, 282 MHz): δ=−128.83.

Example 48

Example 48 was synthesized following the general synthetic procedures of Example 26 starting from 3,5-difluoro-4-formylphenyl morpholine-4-carboxylate (Example 9).

Yield: 209 mg (5%); elemental analysis (%) calculated for C₁₉H₁₈F₂N₂Na₂O₁₀P₂.1.5NaCl.2.2H₂O (707.60): C, 32.25; H, 3.19; N, 3.96. found: C, 32.08; H, 3.34; N, 3.90. ESI MS (H₂O) m/z 535 (M⁺-1). ¹H NMR (D₂O, 300 MHz): δ=8.74-6.81 (m, 7H), 3.76-3.39 (m, 10H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.5. ¹⁹F NMR (CDCl₃, 282.3 MHz, mixture of two-Isomers): δ=−112.8 (d, J=9.0 Hz), −113.2 (d, J=9.3 Hz).

Example 49

Example 49 was synthesized following the general synthetic procedures of Example 26 starting from 2-fluoro-4-formylphenyl dimethylcarbamate (Example 10).

Yield: 518 mg (14%); elemental analysis (%) calculated for C₁₇H₁₇F₁N₂Na₂O₉P₂.1.0NaCl.2.0H₂O (614.76): C, 33.21; H, 3.44; N, 4.56. found: C, 33.20; H, 3.64; N, 4.49. ESI MS (H₂O): m/z: 475 (M⁺-1). ¹H NMR (D₂O, 300 MHz): δ=8.71-6.97 (m, 7H), 6.55-6.37 (m, 1H), 3.42-3.30 (m, 2H), 3.11 (s, 3H), 2.96 (s, 3H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.8, 16.5. ¹⁹F NMR (CDCl₃, 282.3 MHz): δ=−130.0.

Example 50

Example 50 was synthesized following the general synthetic procedures of Example 26 starting from 2-formylphenyl methyl carbonate.

trans-Isomer, yield: 0.19 g (3.7%). Elemental analysis (%) calculated for C₁₆H₁₅NNa₂O₁₀P₂.0.09NaCl.2.2H₂O (534.14): C, 35.98; H, 3.66; N, 2.62. found C, 35.74; H, 3.45; N, 2.89. ESI MS (CH₃CN): m/z 444 (100), 445 (10) calculated m/z 445.26. ¹H NMR (D₂O, 300 MHz): δ=3.37 (t, 2H, J=16.4 Hz), 3.88 (s, 3H), 6.55 (t, 1H, J=5.4 Hz), 7.21 (m, 1H), 7.33 (m, 2H), 7.48 (m, 2H), 8.23 (m, 1H), 8.38 (m, 1H), 8.75 (s, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.21.

Example 51

Example 51 was synthesized following the general synthetic procedures of Example 26 starting from 2-bromo-4-formylphenyl butyrate.

cis-Isomer: yield 0.201 g (6.7%) of title compound as white powder. ¹H NMR (D₂O): δ=8.57 (s, 1H), 8.43 (d, J=5.1 Hz, 1H), 7.99 (s, 1H), 7.96 (d, J=8.2 Hz, 1H), 7.67 (d, J=7.8 Hz, 1H), 7.43 (t, J=5.4 Hz, 1H), 7.31 (d, J=7.8 Hz, 1H), 6.59 (t, J=4.8 Hz, 1H), 3.41 (t, J=12.7 Hz, 2H), 2.73 (t, J=7.2 Hz, 2H), 1.80 (m, J=7.2 Hz, 2H), 1.05 (t, J=7.2 Hz, 3H). ³¹P NMR (D₂O): δ=16.84. LC-MS (ESI) for C₁₈H₂₀BrNO₉P₂ m/z 534 [M-2H]⁻, 536 [M]⁻. Elemental analysis (%) calculated for C₁₈H₁₈BrNNa₂O₉P₂.1H₂O.2NaCl (%): C, 30.23; H, 2.82; N, 1.96. found (%): C, 30.42; H, 3.33; N, 2.35.

Example 52

Example 52 was synthesized following the general synthetic procedures of Example 26 starting from 3-fluoro-4-formylphenyl morpholine-4-carboxylate.

Yield: 0.135 g (3%). Na-salt of title compound as white powder, trans-isomer. ¹H NMR (D₂O): δ=8.78 (s, 1H), 8.45 (d, J=5.1 Hz, 1H), 8.26 (d, J=8.4 Hz, 1H), 7.50 (dd, J=5.1, 8.4 Hz, 1H), 7.17 (t, J=8.7 Hz, 1H), 7.01 (d, J=9.3 Hz, 2H), 6.70 (t, J=6.0 Hz, 1H), 3.90-3.50 (m, 8H), 3.44 (t, J=17.0 Hz, 2H). ³¹P NMR (D₂O): δ=16.42. ¹⁹F NMR (D₂O): δ=−117.27. LC-MS (ESI) for C₁₉H₂₁FN₂O₁₀P₂ m/z 517 [M-H]⁻. Elemental analysis (%) calculated for C₁₉H₁₉FN₂Na₂O₁₀P₂.3.0H₂O (%): C, 37.03; H, 4.09; N, 4.54. found (%): C, 36.89; H, 3.91; N, 4.71.

Example 53

Example 53 was synthesized following the general synthetic procedures of Example 26 starting from 2-fluoro-6-formylphenyl morpholine-4-carboxylate (Example 11).

Yield: 253 mg (7%). Elemental analysis (%) calculated for C₁₉H₁₉Ca₁F₁N₂O₁₀P₂.1.0NaCl.6.0H₂O (775.47): C, 29.43; H, 4.03; N, 3.61. found: C, 29.61; H, 4.01; N, 3.43. ESI MS (H₂O) m/z 517 (M⁺-1). ³¹P NMR (D₂O, 121.5 MHz): δ=16.0, 15.8. (The solubility of this calcium salt in water is very low, and only ³¹P NMR was available).

Example 54

Example 54 was synthesized following the general synthetic procedures of Example 26 starting from 3,5-difluoro-4-formylphenyl isopropyl carbonate (Example 12).

Yield 0.52 g (27%), white solid, contaminated with Risedronate (5%). ¹H NMR (D₂O): δ=8.67 (s, 1H), 8.51 (d, J=5.7 Hz, 1H), 8.24 (d, J=7.8 Hz, 1H), 7.65 (dd, J=5.7, 7.8 Hz, 1H), 7.02 (d, ³J_(FH)=9.0 Hz, 2H), 6.92 (t, J=5.4 Hz, 1H), 5.02 (m, J=6.3 Hz, 1H), 3.47 (t, J=12.6 Hz, 2H), 1.37 (d, J=6.3 Hz, 6H). ³¹P NMR (D₂O): δ=16.40. ¹⁹F NMR (D₂O): δ=−112.324 (d, J_(FF)=9.0 Hz). LC-MS (ESI) for C₁₈H₁₉F₂NO₁₀P₂ m/z 508 [M-H]⁻. Elemental analysis (%) calculated for 0.95C₁₈H₁₇F₂NNa₂O₁₀P₂.0.05C₇H₇NNa₄O₇P₂2H₂O.0.5NaCl (%): C, 34.39; H, 3.39; N, 2.30. found (%): C, 34.02; H, 3.59; N, 2.25.

Example 55

Example 55 was synthesized following the general synthetic procedures of Example 26 starting from 3-fluoro-4-formylphenyl morpholine-4-carboxylate.

Yield: 0.655 g (14%) of Ca-salt of title compound as white powder, mixture of cis- (64%) and trans- (36%) isomers. ¹H NMR (D₂O): δ=8.77 (s, 0.36H-trans), 8.65 (s, 0.64H-cis), 8.50 (d, 0.64H-cis), 8.44 (d, 0.36H-trans), 8.17 (m, 1H-trans,cis), 7.80 (t, J=8.4 Hz, 0.64H-cis), 7.56 (m, 0.64H-cis), 7.48 (m, 0.36H-trans), 7.20-6.84 (m, 2.36H-trans, cis), 6.70 (m, 1H-trans, cis), 3.90-3.50 (m, 8H), 3.46 (m, J=12.0 Hz for cis, 2H-trans, cis). ³¹P NMR (D₂O): δ=16.53-trans, 16.36-cis. LC-MS (ESI) for C₁₉H₂₁FN₂O₁₀P₂ m/z 517 [M-H]⁻. Elemental analysis (%) calculated for C₁₉H₁₉CaFN₂O₁₀P₂.0.1CaCl₂.4.0H₂O (%): C, 35.68; H, 4.26; N, 4.38, Ca 6.89. found (%): C, 35.46; H, 3.86; N, 4.39, Ca 6.80.

Example 56

Example 56 was synthesized following the general synthetic procedures of Example 26 starting from ethyl 3-fluoro-4-formylphenyl carbonate.

Yield: 0.128 g (3.5%). Na-salt of title compound as white powder, mixture of cis- (70%) and trans- (30%) isomers, contaminated with Risedronate (12%). ¹H NMR (D₂O): δ=8.77 (s, 0.3H-trans), 8.61 (s, 0.7H-cis), 8.46 (d, J=3.3 Hz, 1H-trans,cis), 8.22 (d, J=6.9 Hz, 0.3H-trans), 8.18 (t, 0.3H-trans), 8.07 (d, J=7.2 Hz, 0.7H-cis), 7.82 (t, J=8.5 Hz, 0.7H-cis), 7.57 (m, 0.7H-cis), 7.51 (m), 7.46 (m, 0.3H-trans), 7.15 (m), 7.08 (m), 6.84 (t, J=5.1 Hz, 0.7H-cis), 6.69 (t, J=5.0 Hz, 0.3H-trans), 4.36 (q, J=7.2 Hz, 2H), 3.43 (t, J=12.3 Hz, 1.4H-cis), 3.36 (t, J=16.2 Hz, 0.6H-trans), 1.36 (t, J=7.2 Hz, 3H). ³¹P NMR (D₂O): δ=16.68-cis, 16.46-trans. ¹⁹F NMR (D₂O): δ=−116.32 (cis), −116.84 (trans). LC-MS (ESI) for C₁₇H₁₈FNO₁₀P₂ m/z 476 [M-H]⁻. Elemental analysis (%) calculated for 0.88C₁₇H₁₆FNNa₂O₁₀P₂.0.12C₇H₇NNa₄O₇P₂.3H₂O.NaCl (%): C, 30.82; H, 3.42; N, 2.27. found (%): C, 30.50; H, 3.49; N, 2.86.

Example 57

Example 57 was synthesized following the general synthetic procedures of Example 26 starting from ethyl 3-fluoro-4-formylphenyl carbonate.

Yield: 0.100 g (3%). Ca-salt of title compound as white solid, mixture of cis- (78%) and trans- (22%) isomers. ¹H NMR (D₂O): δ=8.79 (s, 0.22H-trans), 8.69 (s, 0.78H-cis), 8.53 (m, 1H-trans, cis), 8.46 (d, 0.22H-trans), 8.32 (d, 0.78H-cis), 7.80 (t, J=8.4 Hz, 0.78H-cis), 7.71 (m, 1H), 7.59 (m, 0.22H-trans), 7.20-7.00 (m, 2H), 6.85 (t, 0.78H-cis), 6.69 (t, 0.22H-trans), 4.36 (q, J=7.2 Hz, 2H), 3.50 (m, J=11.0 Hz for cis, 2H-trans, cis), 1.36 (t, J=7.2 Hz, 3H). ³¹P NMR (D₂O): δ=16.32-trans, 16.11-cis. ¹⁹F NMR (D₂O): δ=−116.31 (cis). LC-MS (ESI) for C₁₇H₁₈FNO₁₀P₂ m/z 476 [M-H]⁻. Elemental analysis (%) calculated for C₁₇H₁₆CaFNO₁₀P₂.2H₂O.CaCl₂ (%): C, 30.83; H, 3.04; N, 2.11. found (%): C, 30.74; H, 3.42; N, 2.77.

Example 58

Example 58 was synthesized following the general synthetic procedures of Example 26 starting from 3,5-difluoro-4-formylphenyl dimethylcarbamate.

Yield: 200 mg, (3%). ¹H NMR (D₂O): δ=2.94 (3H, s), 3.05 (3H, s), 3.37-3.48 (2H, m), 6.80-6.88 (3H, m), 7.47-7.54 (1H, m), 8.05-8.26 (1H, m), 8.42-8.71 (1H, m). ³¹P NMR (D₂O): δ=16.59. Elemental analysis: found C, 34.70%; H, 3.45%; N, 4.7%, calculated for C₁₇H₁₆F₂N₂Na₂O₉P₂(H₂O)_(2.7)C, 34.79%; H, 3.68%; N, 4.77%. LC-MS: (M-1) m/z 493 calculated for C₁₇H₁₈F₂N₂O₉P₂ 494.29.

Example 59

Example 59 was synthesized following the general synthetic procedures of Example 26 starting from methyl 2-(butyryloxy)-5-formylbenzoate.

trans-Isomer, yield: 0.68 g (11.5%). Elemental analysis (%) calculated for C₁₈H₁₉NNa₂O₁₀P₂.0.09NaCl.1.5H₂O (591.62): C, 40.60; H, 4.09; N, 2.37. found C, 40.54; H, 4.07; N, 2.32. ESI MS (CH₃CN): m/z 514 (100), 515 (25) calculated m/z 515.35. ¹H NMR (D₂O, 300 MHz): δ=0.98 (t, 3H, J=7.5 Hz), 1.69 (d, 2H, J=8.1 Hz), 2.63 (d, 2H, J=8.0 Hz), 3.45 (t, 2H, J=16.5 Hz), 3.88 (s, 3H), 6.41 (t, 1H, J=4.5 Hz), 7.18 (m, 1H), 7.40 (m, 1H), 7.47 (m, 1H), 7.73 (m, 1H), 8.18 (m, 1H), 8.33 (m, 1H), 8.69 (s, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.42.

Example 60

Example 60 was synthesized following the general synthetic procedures of Example 26 starting from ethyl 5-fluoro-2-formylphenyl carbonate.

trans-Isomer, yield: 0.231 g (6%), contaminated with Risedronate (9%). ¹H NMR (D₂O): δ=8.72 (s, 1H), 8.40 (d, J=4.5 Hz, 1H), 8.16 (d, J=8.1 Hz, 1H), 7.44 (dd, J=4.5, 8.1 Hz, 1H), 7.30-7.20 (m, 1H), 7.18-7.05 (m, 2H), 6.58 (t, J=4.7 Hz, 1H), 4.39 (q, J=7.2 Hz, 2H), 3.40 (t, J=16.5 Hz, 2H), 1.37 (t, J=7.2 Hz, 3H). ³¹P NMR (D₂O): δ=16.19. ¹⁹F NMR (D₂O): δ=−110.025. LC-MS (ESI) for C₁₇H₁₈FNO₁₀P₂ m/z 476 [M-H]⁻. Elemental analysis (%) calculated for 0.91C₁₇H₁₆FNNa₂O₁₀P₂.0.09C₇H₇NNa₄O₇P₂.3H₂O (%): C, 34.42; H, 3.80; N, 2.49. found (%): C, 34.82; H, 3.50; N, 2.46

cis-Isomer: yield 0.438 g (12%). ¹H NMR (D₂O): δ=8.62 (s, 1H), 8.47 (s, 1H), 8.10 (d, J=7.8 Hz, 1H), 7.83 (t, J=7.8 Hz, 1H), 7.53 (m, 1H), 7.30-7.09 (m, 2H), 6.72 (t, J=5.1 Hz, 1H), 4.40 (q, J=6.9 Hz, 2H), 3.43 (t, J=12.3 Hz, 2H), 1.40 (t, J=6.9 Hz, 3H). ³¹P NMR (D₂O): δ 16.16. ¹⁹F NMR (D₂O): δ −110.124. LC-MS (ESI) for C₁₇H₁₈FNO₁₀P₂ m/z 476 [M-H]⁻. Elemental analysis (%) calculated for C₁₇H₁₆FNNa₂O₁₀P₂.3NaCl (%): C, 29.31; H, 2.31; N, 2.01. found (%): C, 28.94; H, 2.67; N, 2.47.

Example 61

Example 61 was synthesized following the general synthetic procedures of Example 26 starting from 3,5-difluoro-4-formylphenyl octan-2-yl carbonate (Example 13).

Yield: 394 mg (13%). Elemental analysis (%) calculated for C₂₃H₂₇F₂N₁Na₂O₁₀P₂.0.3NaCl.0.6H₂O (651.76): C, 42.39; H, 4.36; N, 2.15. found: C, 42.27; H, 4.32; N, 2.32; ESI MS (H₂O): m/z: 578 (M⁺-1). ¹H NMR (D₂O, 300 MHz): δ=8.56-6.73 (m, 7H), 4.82 (m, 1H), 3.45-3.29 (m, 2H), 1.66-0.60 (m, 16H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.6, 16.5. ¹⁹F NMR (CDCl₃, 282.3 MHz): δ=−112.5.

Example 62

Example 62 was synthesized following the general synthetic procedures of Example 26 starting from 2-formylphenyl isopropyl carbonate.

cis-Isomer, yield: 0.46 g (7.4%). Elemental analysis (%) calculated for C₁₈H₁₉NNa₂O₁₀P₂.0.9NaCl.2.9H₂O.0.2CH₃CN. (630.36): C, 35.06; H, 4.06, N, 2.67. found C, 34.81; H, 3.95; N, 2.83. ESI MS (CH₃CN): m/z 472 (100), 473 (25) calculated m/z 473.32. ¹H NMR (D₂O, 300 MHz): δ=1.33 (d, 3H, J=6.3 Hz), 3.36 (t, 2H, J=12.3 Hz), 4.95 (sept, 1H, J=6.0 Hz), 6.67 (t, 1H, J=4.5 Hz), 7.21 (d, 1H, J=8.4 Hz), 7.39 (m, 1H), 7.47 (m, 2H, J=7.8 Hz), 7.74 (d, 1H, J=7.8 Hz), 8.05 (m, 1H, J=8.1 Hz), 8.40 (m, 1H), 8.54 (s, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.08.

trans-Isomer, yield: 0.46 g (8.1%). Elemental analysis (%) calculated for C₁₈H₁₉NNa₂O₁₀P₂.0.7NaCl.2.5H₂O (564.38): C, 38.29; H, 4.21; N, 2.48. found C, 38.03; H, 4.16; N, 2.49. ESI MS (CH₃CN): m/z 472 (100), 473 (25) calculated m/z 473.32. ¹H NMR (D₂O, 300 MHz): δ=1.32 (d, 3H, J=6.3 Hz), 3.36 (t, 2H, J=16.6 Hz), 4.96 (sept, 1H, J=5.5 Hz), 6.55 (t, 1H, J=5.1 Hz), 7.18 (m, 2H), 7.31 (m, 1H), 7.43 (m, 2H), 8.16 (m, 1H, J=7.2 Hz), 8.36 (d, 1H, J=5.4 Hz), 8.67 (s, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.22.

Example 62a (trans)(monosodium salt)

Example 62a (PG 990) was produced as follows to obtain the monosodium salt of Example 62 (trans):

i) Isopropoxycarbonylsalicylaldehyde

A solution of salicylaldehyde (444 g, 3.64 mol) in acetonitrile (3.6 L) was treated with potassium carbonate (powder, 753 g, 5.45 mol) and isopropyl chloroformate (1 M in toluene, 4 L, 4 mol) was added over 1 hour. The temperature of the mixture rose to 28° C. during the addition. The resulting suspension was mechanically stirred for 3-4 days. The mixture was filtered and the filtrate was concentrated on a rotory evaporator (rotovap). The residue was taken up in 1.6 L total volume of 1:1 ethyl acetate:heptane, washed with 2×250 mL of half-saturated ice-brine followed by brine, dried over magnesium sulfate, filtered and concentrated on the rotovap finishing at 60° C./˜5 mm Hg to give 763.9 grams (˜100% yield) of 1, GC purity 98.5%.

ii) BOC-chlorobenzyl Intermediate

Triphosgene (359.6 g, 1.212 mol) was dissolved in 2 L of toluene under nitrogen and the solution was added over about 1 hour to a mixture of pyridine (30 mL, 0.369 mol) in 2 L of toluene in a 12 L 4-neck flask equipped with mechanical stirrer, addition funnel with nitrogen inlet, and thermocouple probe, with ice-bath cooling, keeping the temperature below 9° C. Compound 1 (designated as #1 in the schematic diagram directly above) (763.9 g, about 3.635 mol) was then added over about 3 minutes with a 100 mL toluene rinse, while the temperature remained between 6.3-6.9° C. The mixture was then warmed to room temperature over a period of 30 minutes, warmed to 40° C. for 1 hour, and chilled in an ice bath. Tert-butanol (277.6 g, 3.745 mol) in toluene (300 mL) was added over about 10 minutes whilst maintaining a temperature below 10° C. Pyridine (273 mL, 3.354 mol) was then added slowly over 35 minutes, maintaining the temperature between 14-15° C. The mixture was then warmed to room temperature and stirred for 2 hours, then filtered. The filter cake was washed with 500 mL toluene, and the filtrate was concentrated on the rotary evaporator to give the intermediate compound 2 (designated as #2 in the schematic diagram directly above) (1.201 kg, 96% yield, NMR purity ˜90-95%).

iii) Drying of Risedronic Acid

Risedronic acid (designated as #3 in the schematic diagram directly above) (923.6 g) was suspended in 1.5 L of mesitylene in a 3 L 3-neck flask equipped with a mechanical stirrer and Dean-Stark trap, and was heated at reflux until was removed from the distillate and about 60 mL of water had been collected. This process took about 1.5 hours. The mixture was cooled and filtered, and the filter cake was washed with heptane and pulled dry under a filter dam. The precipitate was transferred to a 3 L flask and further dried on the rotary evaporator at maximum vacuum (ca 1-5 mm Hg) and 100° C. until no additional solvent distilled. 862.6 grams of dried risedronic acid were obtained.

Dried risedronic acid (500 g, 1.766 mol) and diisopropylethylamine (913 g, 7.06 mol) were suspended in acetonitrile (5 L) in a 12 L, 3-necked flask, and the mixture was heated at 70° C. for 2 hours until the solution became clear. The mixture was cooled to room temperature, treated with the intermediate, compound 2 (1.201 kg, ˜3.24 mol), and the mixture heated at 35° C. for 38 hours. The reaction mixture was concentrated to give 2.11 kg of a thick oil. This crude reaction mixture was diluted with 1 L of acetonitrile and was applied to a silica gel column (Sorbent Technologies 60 Å, 40-75μ, cat. no. 52500-20, 6.1 kg, ca. 19×47 cm) packed in acetonitrile, and eluted successively with 20 L acetonitrile, 20 L 10% methanol/acetonitrile, 4 L 30% methanol/acetonitrile, 8 L 35% methanol/acetonitrile, and 28 L 37.5% methanol/acetonitrile.

Approximately 1 gallon fractions were collected and analyzed by MS and NMR. Product began eluting in fraction 15, and fraction 22 was mostly impurities. Fractions 15-21 were combined and evaporated to give 305.6 grams of a thick oil. This oil was dissolved with agitation in 300 mL of distilled water and applied to an Amberlite IR120 (plus) sodium form column (2.1 kg, 2.4 L bed volume in an 11 cm diameter column). The product was eluted with distilled water, collecting the main band of product in 1.1 L of water and tailing fractions in 400 mL of water. The fractions were kept cold with an ice bath. The fractions were divided into 6×1200 mL lyophilization flasks, frozen, and lyophilized for 3 days. The main band fractions weighed 194.23 g, and the tailing fractions weighed 3.65 g. The combined fractions were treated with methanol and water (30 mL) (total volume was about 1.1 L). A white precipitate began to form before the crude product had entirely dissolved. The mixture was stirred mechanically at room temperature until all of the gummy material had converted to free-flowing solids, then was stirred an additional hour, then chilled in an ice bath with stirring for 2 hours. The solids were collected by filtration and washed with about 200 mL of cold methanol followed by about 200 mL of ether. It was then air-dried in the funnel and allowed to reach room temperature. It was transferred to a tared bottle and further dried for two days on a lyophilizer to give 59.11 g of PG 990 (Example 62a (trans)) as a white powder. NMR analysis indicated that this product was a mixture of about 85:15 trans-:cis-isomers (³¹P) and contained about 0.4 mol of methanol.

iv) Purification

47.9 grams of this white powder was recrystallized by dissolving it in 720 mL of water, filtering it through a glass microfiber filter, and subsequent dilution to 2.3 L with acetone. The resulting suspension was stirred at room temperature for 1 hour, then cooled in an ice bath for 2 hours, and the product collected by filtration and washed with 200 mL of acetone. The solids were dried in the filter under suction overnight to give 38.13 grams (79.6% recovery) of product at >about 98% purity with <0.5% risedronate, <0.5% of the cis-compound, and about 1.1 mol % acetone by NMR.

Specifically, the trans isomer of Example 62 was synthesized according to the following procedures.

To a 300 mL dry round bottom flask was added risedronate (12.2 g, 43.2 mmol), anhydrous acetronitrile (75 mL) and diisopropylethylamine (30 mL, 172.8 mmol). After stirring at 45° C. under N₂ for 1 hour, this mixture became clear, and then was stirred in an ice-water bath and cooled to 5° C. A solution of chlorocarbonate (designated as #1 in the schematic diagram directly above) (31.0 g, 77.7 mmol) in 35 mL of anhydrous acetronitrile was injected into the cooled mixture. The cold bath was removed and the resulting mixture was stirred at 30° C. under N₂ atmosphere for 6 hours. This reaction mixture was poured into a 250 g of silica gel chromatography (10.5 cm height). The column was eluted with 1.5 L of acetronitrile, then 1.5 L of 50% methanol/acetronitrile. The second fraction (50% methanol/acetronitrile) was concentrated to give 28.96 g of brown gummy oil. This DIPEA salt then was passed through a 200 g of Amberlite Na⁺ ion-exchange column.

The resultant mixture was then lyophilized and produced 18.15 g of orange solid. To this solid, methanol (60 mL) was added and the resulting mixture was first stirred at room temperature for 2 hours, then further cooled in the ice-water bath for 2 hours. The resulting solid was collected by filtration and washed with cold methanol (5 mL×2), then acetronitrile (10 mL).

After further drying in the lyophilizer, 3.35 g of product (Example 62 (trans)) was obtained as a white powder, pure trans-isomer, by ³¹P NMR. Yield: 15%.

Example 63

Example 63 was synthesized following the general synthetic procedures of Example 26 starting from 3-fluoro-4-formylphenyl isopropyl carbonate.

trans-Isomer: yield 0.259 g (7%). ¹H NMR (D₂O): δ=8.76 (s, 1H), 8.41 (d, J=4.8 Hz, 1H), 8.15 (d, J=7.8 Hz, 1H), 7.41 (dd, J=4.8, 7.8 Hz, 1H), 7.20-7.04 (m, 3H), 6.70 (t, J=4.5 Hz, 1H), 5.03 (m, J=6.0 Hz, 1H), 3.41 (t, J=17.1 Hz, 2H), 1.40 (d, J=6.0 Hz, 6H). ³¹P NMR (D₂O): δ=16.54. ¹⁹F NMR (D₂O): δ −117.032. LC-MS (ESI) for C₁₈H₂₀FNO₁₀P₂ m/z 490 [M-H]⁻ Calc. for C₁₈H₁₈FNNa₂O₁₀P₂.2H₂O (%): C, 37.84; H, 3.88; N, 2.45. found (%): C, 37.83; H, 4.19; N, 2.19.

cis-Isomer: yield 0.4 g (10.5%), contaminated with Risedronate (5%). ¹H NMR (D₂O): δ=8.57 (s, 1H), 8.43 (d, J=5.1 Hz, 1H), 7.98 (d, J=7.2 Hz, 1H), 7.82 (t, J=8.1 Hz, 1H), 7.43 (m, 1H), 7.22-7.10 (m, 2H), 6.83 (t, J=5.1 Hz, 1H), 5.00 (m, J=6.3 Hz, 1H), 3.41 (t, J=12.3 Hz, 2H), 1.37 (d, J=6.3 Hz, 6H). ³¹P NMR (D₂O): δ=16.78. ¹⁹F NMR (D₂O): δ=−116.361. LC-MS (ESI) for C₁₈H₂₀FNO₁₀P₂ m/z 490 [M-H]⁻. Calc. for 0.95C₁₈H₁₈FNNa₂O₁₀P₂.0.05C₇H₇NNa₄O₇P₂.0.6H₂O.2NaCl(%): C, 32.23; H, 2.92; N, 2.15. found (%): C, 32.60; H, 3.34; N, 2.29.

Example 64

Example 64 was synthesized following the general synthetic procedures of Example 26 starting from 5-fluoro-2-formylphenyl isopropyl carbonate.

trans-Isomer: yield 0.774 g (20.5%). ¹H NMR (D₂O): δ=8.71 (s, 1H), 8.40 (d, J=4.5 Hz, 1H), 8.14 (d, J=8.4 Hz, 1H), 7.42 (dd, J=4.5, 8.4 Hz, 1H), 7.23 (m, 1H), 7.11 (m, 2H), 6.58 (t, J=4.5 Hz, 1H), 5.03 (m, 1H), 3.40 (t, J=16.2 Hz, 2H), 1.39 (d, J=6.3 Hz, 6H). ³¹P NMR (D₂O): δ=16.15. ¹⁹F NMR (D₂O): δ −110.102. LC-MS (ESI) for C₁₈H₂₀FNO₁₀P₂ m/z 490 [M-H]⁻. Elemental analysis (%) calculated for C₁₈H₁₈FNNa₂O₁₀P₂.1.8H₂O (%): C, 38.08; H, 3.83; N, 2.47. found (%): C, 38.32; H, 3.98; N, 2.30.

cis-Isomer: yield 0.25 g (6.5%), contaminated with Risedronate (5%) and 5-member ring product (10%). ¹H NMR (D₂O): δ=8.59 (s, 1H), 8.45 (d, J=3.9 Hz, 1H), 8.04 (d, J=8.1 Hz, 1H), 7.83 (dd, J=3.9, 8.1 Hz, 1H), 7.48 (m, 1H), 7.26-7.08 (m, 2H), 6.72 (t, J=5.0 Hz, 1H), 5.03 (m, J=6.3 Hz, 1H), 3.41 (t, J=12.5 Hz, 2H), 1.41 (t, J=6.3 Hz, 6H). ³¹P NMR (D₂O): δ=16.15. ¹⁹F NMR (D₂O): δ=−110.189. LC-MS (ESI) for C₁₈H₂₀FNO₁₀P₂ m/z 490 [M-H]⁻. Elemental analysis (%) calculated for 0.85C₁₈H₁₈FNNa₂O₁₀P₂.0.1C₁₈H₁₇FNNa₃O₁₀P₂.0.05C₇H₇NNa₄O₇P₂.H₂O.NaCl (%): C, 34.60; H, 3.22; N, 2.31. found (%): C, 34.34; H, 3.41; N, 2.52.

Example 65

Example 65 was synthesized following the general synthetic procedures of Example 26 starting from 3,5-difluoro-4-formylphenyl 2-oxooxazolidine-3-carboxylate (Example 3).

Yield: 545 mg (19%). Elemental analysis (%) calculated for C₁₈H₁₆F₂N₂Na₂O₁₁P₂.0.3NaCl.1.3H₂O (621.22): C, 34.80; H, 2.69; N, 4.51. found: C, 34.88; H, 2.71; N, 4.41; ESI MS (H₂O) m/z 535 (M⁺-1). ¹H NMR (D₂O, 300 MHz): δ=8.55-6.87 (m, 7H), 4.51 (t, J=7.2 Hz, 2H), 4.20 (t, J=7.2 Hz, 2H), 3.36 (t, J=12.3 Hz, 2H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.6. ¹⁹F NMR (CDCl₃, 282.3 MHz): δ=−112.0 (d, J=9.0 Hz).

Example 66

Example 66 was synthesized following the general synthetic procedures of Example 26 starting from (3-fluoro-4-formylphenoxy)methyl butyrate (Example 14).

Yield: 195 mg (7%); elemental analysis (%) calculated for C₁₉H₂₀F₁N₁Na₂O₁₀P₂.1.0NaCl.0.8H₂O (622.18): C, 36.68; H, 3.50; N, 2.25. found: C, 36.77; H, 3.49; N, 2.28; ESI MS (H₂O): m/z: 504 (M⁺-1). ¹H NMR (D₂O, 300 MHz): δ=8.70-6.61 (m, 8H), 5.80-5.77 (m, 2H), 3.40-3.25 (m, 2H), 2.37 (t, J=7.5 Hz, 2H), 1.56 (sextet, J=7.5 Hz, 2H), 0.82 (t, J=7.5 Hz, 3H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.8, 16.6. ¹⁹F NMR (CDCl₃, 282.3 MHz): δ=−116.9.

Example 67

Example 67 was synthesized following the general synthetic procedures of Example 26 starting from 3-fluoro-2-formylphenyl dimethylcarbamate.

Yield: 0.12 g (2%). Elemental analysis (%) calculated for C₁₇H₁₇FN₂Na₂O₉P₂.0.7NaCl.2.5H₂O (606.23): C, 33.68; H, 3.66; N, 4.62. found C, 33.43; H, 3.41; N, 4.39. ESI MS (CH₃CN): m/z 475 (100), 476 (20) calculated m/z 476.29. ¹H NMR (D₂O, 300 MHz): δ=2.94 (d, 3H, J=12.3 Hz), 3.12 (d, 3H, J=10.8 Hz), 3.36 (m, 2H), 6.80 (t, 1H, J=5.1 Hz), 6.85 (t, 1H, J=6.0 Hz), 6.91 (m, 1H), 7.14 (m, 1H), 7.33 (m, 1H), 7.47 (m, 2H), 8.05 (m, 1H), 8.18 (m, 1H), 8.42 (m, 1H), 8.55 (s, 1H), 8.61 (s, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.50 (trans); 16.74 (cis). ¹⁹F NMR (D₂O, 282 MHz): δ=−116.65, −115.81.

Example 68

Example 68 was synthesized following the general synthetic procedures of Example 26 starting from 3,5-difluoro-4-formylphenyl ethyl carbonate.

cis-Isomer: yield 0.265 g, white solid, contaminated with Risedronate (3.5%) and 5-member ring product (11%). ¹H NMR (D₂O): δ=8.68 (s, 1H), 8.54 (d, J=5.1 Hz, 1H), 8.29 (d, J=6.6 Hz, 1H), 7.69 (t, 1H), 7.03 (d, J=9.9 Hz, 2H), 6.92 (t, J=5.5 Hz, 1H), 4.37 (q, J=7.2 Hz, 2H), 3.48 (t, J=12.3 Hz, 2H), 1.36 (t, J=7.2 Hz, 3H). ³¹P NMR (D₂O): δ=16.36. ¹⁹F NMR (D₂O): δ=−112.291 (d, J_(FF)=9.3 Hz). LC-MS (ESI) for C₁₇H₁₇F₂NO₁₀P₂ m/z 494 [M-H]⁻. Elemental analysis (%) calculated for 0.855C₁₇H₁₅F₂NNa₂O₁₀P₂.0.11C₁₇H₁₄F₂NNa₃O₁₀P₂.0.035C₇H₇NNa₄O₇P₂—H₂O.Na Cl (%): C, 32.66; H, 2.73; N, 2.29. found (%): C, 33.00; H, 3.08; N, 2.38.

Example 69

Example 69 was synthesized following the general synthetic procedures of Example 26 starting from (R)-methyl 3-((3,5-difluoro-4-formylphenoxy)carbonyloxy)butanoate.

cis-Isomer, yield: 0.35 g (4.7%). Elemental analysis (%) calculated for C₂₀H₁₉F₂NNa₂O₁₂P₂.1.3NaCl.3.0H₂O (741.35): C, 32.40; H, 3.40; N, 1.89. found C, 32.15; H, 3.14; N, 2.15. ESI MS (CH₃CN): m/z 566 (100), 568 (35) calculated m/z 567.33. ¹H NMR (D₂O, 300 MHz): δ=1.37 (d, 3H, J=6.3 Hz), 2.76 (d, 2H, J=6.3 Hz), 3.40 (t, 2H, J=12.1 Hz), 3.67 (s, 3H), 5.22 (sext, 1H, J=6.6 Hz), 6.18 (d, 1H, J=13.2 Hz), 6.84 (t, 1H, J=4.5 Hz), 6.95 (1H, d, J=8.7 Hz), 7.61 (m, 1H), 8.19 (d, 1H, J=7.8 Hz), 8.47 (m, 1H), 8.61 (s, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.35. ¹⁹F NMR (D₂O, 282 MHz): δ=−112.13, −115.61.

Example 70

Example 70 was synthesized following the general synthetic procedures of Example 26 starting from ethyl 2-formylphenyl carbonate.

Yield: 0.16 g (3.0%). Elemental analysis (%) calculated for C₁₇H₁₇NNa₂O₁₀P₂.0.1NaCl.2.2H₂O (548.75): C, 37.21; H, 3.93; N, 2.55. found C, 36.98; H, 3.81; N, 2.47. ESI MS (CH₃CN): m/z 458 (100), 459 (20) calculated m/z 459.29. ¹H NMR (D₂O, 300 MHz): δ=1.30 (t, 3H, J=7.2 Hz), 3.35 (t, 2H, J=16.2 Hz), 4.31 (q, 4H, J=7.1 Hz), 6.54 (t, 1H, J=4.8 Hz), 7.18 (d, 1H, J=8.4 Hz), 7.31 (m, 2H), 7.43 (m, 2H), 8.11 (d, 1H, J=7.8 Hz), 8.34 (d, 1H, J=8.34 Hz), 8.65 (s, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.25.

Example 71

Example 71 was synthesized following the general synthetic procedures of Example 26 starting from (3,5-difluoro-4-formylphenoxy)methyl pentanoate.

Yield 400 mg (10%) for cis- and trans-isomers. ¹H NMR (D₂O, 300 MHz): δ=8.64-8.52 (m, 2H), 8.11-7.93 (m, 1H), 7.41 (m, 1H), 6.82-6.70 (m, 3H), 4.75 (s, 2H), 3.43-3.3.0 (m, 2H), 2.36 (t, 2H), 1.59-1.51 (m, 2H), 0.81 (t, 3H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.748, 16.688. MS (M-1) m/z: 522. Elemental analysis (%) calculated for C₁₉H₂₁NO₁₀P₂Na₂.2.H₂O.NaCl (567): C, 34.38; H, 3.80; N, 2.11. found: C, 34.57; H, 3.54; N, 2.17.

Example 72

Example 72 was synthesized following the general synthetic procedures of Example 26 starting from 3,5-difluoro-4-formylphenyl methyl carbonate.

Yield: 0.23 g (4.3%). Elemental analysis (%) calculated for C₁₆H₁₅F₂NNa₂O₁₀P₂.0.2NaCl.0.97H₂O (554.39): C, 34.66; H, 2.72; N, 2.53. found C, 34.96; H, 3.14; N, 2.17. ESI MS (CH₃CN): m/z 480 (100), 481 (50), 484 (40) calculated m/z 481.24. ¹H NMR (D₂O, 300 MHz): δ=3.40 (t, 2H, J=12.6 Hz), 3.86 (s, 3H), 6.17 (m, 1H), 6.49 (t, 1H, J=5.3 Hz), 6.96 (m, 1H), 7.59 (m, 1H), 8.18 (m, 1H), 8.46 (m, 1H), 8.60 (s, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.43. ¹⁹F NMR (D₂O, 282 MHz): δ=−112.24.

Example 73

Example 73 was synthesized following the general synthetic procedures of Example 26 starting from 4-formylphenyl methyl carbonate.

trans-Isomer: yield 0.327 g (11%) of title compound as white solid. ¹H NMR (D₂O): δ=8.77 (s, 1H), 8.43 (d, J=5.1 Hz, 1H), 8.20 (d, J=7.2 Hz, 1H), 7.46 (dd, J=5.1, 7.2 Hz, 1H), 7.30 (d, J=8.8 Hz for AB-system, 2H), 7.25 (d, J=8.8 Hz for AB-system, 2H), 6.47 (t, J=4.7 Hz, 1H), 3.94 (s, 3H), 3.42 (t, J=17.1 Hz, 2H). ³¹P NMR (D₂O): δ=16.53. LC-MS (ESI) for C₁₆H₁₇NO₁₀P₂ m/z 444 [M-H]⁻. Calc. for C₁₆H₁₅NNa₂O₁₀P₂. 3H₂O (%): C, 35.37; H, 3.90; N, 2.58. found (%): C, 35.50; H, 3.94; N, 2.54.

Example 74

Example 74 was synthesized following the general synthetic procedures of Example 26 starting from 2-chloro-4-formylphenyl ethyl carbonate.

trans-Isomer: yield 0.156 g (5.5%) of title compound as white powder. ¹H NMR (D₂O): δ=8.79 (s, 1H), 8.47 (d, J=4.5 Hz, 1H), 8.24 (d, J=8.1 Hz, 1H), 7.49 (dd, J=5.0, 8.1 Hz, 1H), 7.39-7.23 (m, 3H), 6.43 (t, J=4.9 Hz, 1H), 4.42 (q, J=7.2 Hz, 2H), 3.43 (t, J=17.4 Hz, 2H), 1.40 (t, J=7.2 Hz, 3H). ³¹P NMR (D₂O): δ=16.31. LC-MS (ESI) for C₁₇H₁₈ClNO₁₀P₂ m/z 492 [M-2H]⁻, 494 [M]⁻. Elemental analysis (%) calculated for C₁₇H₁₆ClNNa₂O₁₀P₂.2H₂O.0.5NaCl(%): C, 33.86; H, 3.34; N, 2.32. found (%): C, 34.18; H, 3.14; N, 1.80.

Example 75

Example 75 was synthesized following the general synthetic procedures of Example 26 starting from 4-formylphenyl 2-oxooxazolidine-3-carboxylate.

Yield 217 mg (10%). ¹H NMR (D₂O, 300 MHz): δ=8.42 (s, 1H), 8.29 (m, 1H), 8.14 (m, 1H), 7.96-7.81 (m, 1H), 7.36 (d, 2H), 7.24 (m, 1H), 6.87 (d, 2H), 6.52 (t, 2H), 6.21-6.05 (m, 1H), 4.24 (t, 2H), 3.94 (t, 2H), 3.14-3.01 (m, 2H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.343, 16.051. MS (M-1) m/z: 499. Elemental analysis (%) calculated for C₁₈H₁₈N₂O₁₁P₂Na₂.11% risedronate.1.2H₂O.0.2NaCl (563.3): C, 36.56; H, 3.68; N, 4.79. found: C, 36.25; H, 3.30; N, 4.64.

Example 76

Example 76 was synthesized following the general synthetic procedures of Example 26 starting from 3,5-dichloro-4-formylphenyl isopropyl carbonate (Example 15).

cis-Isomer, yield: 258 mg (9%). Elemental analysis (%) calculated for C₁₈H₁₇Cl₂N₁Na₂O₁₀P₂.1.0NaCl.2.0H₂O (680.67): C, 31.76; H, 3.11; N, 2.06. found: C, 31.30; H, 3.20; N, 2.52. ESI MS (H₂O) m/z 540 (M⁺-1). ¹H NMR (D₂O, 300 MHz): δ=8.56-7.18 (m, 7H), 4.90 (m, 1H), 3.38 (t, J=12.5 Hz, 2H), 1.30 (d, J=6.0 Hz, 6H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.5.

Example 77

Example 77 was synthesized following the general synthetic procedures of Example 26 starting from 2-chloro-6-fluoro-4-formylphenyl 2-oxooxazolidine-3-carboxylate.

trans-Isomer, yield: 0.15 g (2%). Elemental analysis (%) calculated for C₁₈H₁₅ClFN₂Na₂O₁₁P₂.1.1NaCl.4.3H₂O (750.17): C, 28.82; H, 3.04; N, 3.73. found: C, 29.10; H, 3.05; N, 3.12. ESI MS (CH₃CN): m/z 551 (100), 553 (75), 555 (30) calculated m/z 552.73. ¹H NMR (D₂O, 300 MHz): δ=3.30 (t, 3H, J=15.9 Hz), 4.30 (t, 2H, J=7.7 Hz), 4.55 (t, 2H, J=8.3 Hz), 6.50 (t, 1H, J=5.2 Hz), 7.41 (m, 1H), 7.62 (m, 1H), 7.68 (s, 1H), 7.94 (s, 1H), 8.34 (m, 1H), 8.45 (s, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.82. ¹⁹F NMR (D₂O, 282 MHz): δ=−125.56.

Example 78

Example 78 was synthesized following the general synthetic procedures of Example 26 starting from cyclobutyl 2-formylphenyl carbonate.

trans-Isomer: yield 0.129 g (4.6%). ¹H NMR (D₂O): δ=8.82 (s, 1H), 8.54 (m, 2H), 7.77 (dd, J=5.4, 7.8 Hz, 1H), 7.53 (m, 1H), 7.38 (m, 2H), 7.26 (d, J=8.7 Hz, 1H), 6.61 (t, J=5.1 Hz, 1H), 5.06 (m, J=7.0 Hz, 1H), 3.51 (t, J=15.3 Hz, 2H), 2.45-2.20 (m, 4H), 1.84 (m, 1H), 1.65 (m, 1H). ³¹P NMR (D₂O): δ=15.80. LC-MS (ESI) for C₁₉H₂₁NO₁₀P₂ m/z 484 [M-H]⁻. Elemental analysis (%) calculated for C₁₉H₁₉NNa₂O₁₀P₂.3H₂O (%): C, 39.12; H, 4.32; N, 2.40. found (%): C, 39.39; H, 3.98; N, 2.31.

cis-Isomer: yield 0.143 g (5.1%). ¹H NMR (D₂O): δ=8.75 (s, 1H), 8.66-8.44 (m, 2H), 7.82 (m, 2H), 7.64-7.24 (m, 3H), 6.75 (t, J=5.2 Hz, 1H), 5.07 (m, J=7.2 Hz, 1H), 3.53 (t, J=12.3 Hz, 2H), 2.50-2.20 (m, 4H), 1.86 (m, 1H), 1.68 (m, 1H). ³¹P NMR (D₂O): δ=15.71. LC-MS (ESI) for C₁₉H₂₁NO₁₀P₂ m/z 484 [M-H]⁻. Elemental analysis (%) calculated for C₁₉H₁₉NNa₂O₁₀P₂.1.5H₂O.2NaCl (%): C, 33.90; H, 3.29; N, 2.08. found (%): C, 34.10; H, 3.60; N, 2.28.

Example 79

Example 79 was synthesized following the general synthetic procedures of Example 26 starting from 4-formylphenyl 2-phenylacetate.

trans-Isomer, yield: 0.12 g (2%). Elemental analysis (%) calculated for C₂₂H₁₉NNa₂O₉P₂.0.2NaCl.3.3H₂O (620.48): C, 36.61; H, 4.24; N, 2.25. found C, 36.54; H, 4.53; N, 2.15. ESI MS (CH₃CN): m/z 504 (100), 505 (50), 506 (5) calculated m/z 505.36. ¹H NMR (D₂O, 300 MHz): δ=3.35 (t, 2H, J=17.2 Hz), 3.98 (s, 2H), 6.39 (t, 1H, J=6.3 Hz), 7.07 (d, 2H, J=7.5 Hz), 7.23 (d, 2H, J=8.1 Hz), 7.39 (m, 5H), 8.14 (m, 1H, J=6.3 Hz), 8.35 (m, 2H), 8.68 (s, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.49.

cis-Isomer, yield: 0.33 g (5.3%). Elemental analysis (%) calculated for C₂₂H₁₉NNa₂O₉P₂.0.2NaCl.3.3H₂O (620.48): C, 41.07; H, 3.70; N, 2.18. found C, 40.78; H, 3.83; N, 2.59. ESI MS (CH₃CN): 504 (100), 505 (50), 506 (5) calculated m/z 505.36. ¹H NMR (D₂O, 300 MHz): δ=3.38 (t, 2H, J=12.3 Hz), 3.99 (s, 2H), 6.55 (t, 1H, J=4.5 Hz), 7.15 (d, 2H, J=7.5 Hz), 7.40 (m, 5H), 7.51 (m, 2H), 7.62 (d, 1H, J=8.4 Hz), 8.08 (m, 1H, J=7.5 Hz), 8.43 (m, 1H), 8.57 (s, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.69.

Example 80

Example 80 was synthesized following the general synthetic procedures of Example 26 starting from 2,6-difluoro-3-methoxybenzaldehyde.

Yield 0.135 g (4%) of title compound as white solid, mixture of cis (40%) and trans (60%) isomers. ¹H NMR (D₂O): δ=8.81 (s, 0.6H-trans), 8.65 (s, 0.4H-cis), 8.54 (d, J=5.7 Hz, 0.6H-trans), 8.50 (d, J=5.7 Hz, 0.4H-cis), 8.44 (d, J=7.5 Hz, 0.6H-trans), 8.18 (d, J=7.8 Hz, 0.4H-cis), 7.69 (dd, J=5.7 Hz, J=7.5 Hz, 0.6H-trans), 7.60 (dd, J=5.7, 7.8 Hz, 0.4H-cis), 7.28-6.90 (m, 2H), 6.84 (t, J=5.1 Hz, 1H-trans,cis), 6.38 (t, 0.44H-trans), 3.90 (s, 1.2H-cis), 3.88 (s, 1.8H-trans), 3.51 (t, J=15.9 Hz, 1.2H-trans), 3.46 (t, J=12.9 Hz, 0.8H-cis). ³¹P NMR (D₂O): δ=16.48-cis, 16.44-trans. ¹⁹F NMR (D₂O): δ=−136.074 (J=9.3 Hz, cis), −136.560 (J=9.3 Hz, trans), −125.182 (J=7.9 Hz, cis), −125.636 (J=7.9 Hz, trans). LC-MS (ESI) for C₁₅H₁₅F₂NO₈P₂ m/z 436 [M-H]⁻. Elemental analysis (%) calculated for C₁₅H₁₃F₂NNa₂O₈P₂.3H₂O.0.5NaCl (%): C, 31.92; H, 3.39; N, 2.48. found (%): C, 32.11; H, 3.48; N, 2.45.

Example 81

Example 81 was synthesized following the general synthetic procedures of Example 26 starting from 2-chloro-4-formylphenyl 2-oxooxazolidine-3-carboxylate.

Yield: 0.33 g (5%). Elemental analysis (%) calculated for C₁₈H₁₅ClN₂Na₂O₁₁P₂.1.1NaCl.3.8H₂O (676.03): C, 31.98; H, 3.37; N, 4.14. found: C, 31.76; H, 3.13; N, 4.11. ESI MS (CH₃CN): m/z 533 (100), 535 (30) calculated m/z 534.74. ¹H NMR (D₂O, 300 MHz): δ=3.37 (t, 3H, J=12.7 Hz), 4.25 (t, 2H, J=7.8 Hz), 4.52 (t, 2H, J=8.4 Hz), 6.54 (t, 1H, J=5.1 Hz), 7.26 (m, 1H), 7.39 (m, 1H), 7.60 (s, 1H), 7.80 (s, 1H), 7.94 (d, 1H, J=7.8 Hz), 8.39 (m, 1H), 8.52 (s, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.82.

Example 82

Example 82 was synthesized following the general synthetic procedures of Example 26 starting from 2-formylphenyl 2-oxooxazolidine-3-carboxylate.

Yield: 0.33 g (5.3%). Elemental analysis (%) calculated for C₁₈H₁₉N₂Na₂O₁₁P₂.0.3NaCl.3.7H₂O (628.47): C, 34.40; H, 3.75; N, 4.46. found C, 34.39; H, 4.07; N, 4.66. ESI MS (CH₃CN): m/z 499 (100), 500 (24) calculated m/z 500.30. ¹H NMR (D₂O, 300 MHz): δ=3.04 (t, 3H, J=16.5 Hz), 3.99 (t, 2H, J=8.1 Hz), 4.21 (t, 2H, J=16.3 Hz), 6.24 (t, 1H, J=4.5 Hz), 6.91 (m, 1H), 6.98 (m, 2H), 7.17 (m, 1H), 7.92 (m, 2H), 8.11 (m, 1H), 8.37 (s, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=15.88.

Example 83

Example 83 was synthesized following the general synthetic procedures of Example 26 starting from 3,5-difluoro-4-formylphenyl 5,5-dimethyl-2-oxooxazolidine-3-carboxylate (Example 16).

cis-Isomer, yield: 312 mg (10%). Elemental analysis (%) calculated for C₂₀H₁₈F₂N₂Na₂O₁₁P₂.0.5NaCl.1.8H₂O (669.97): C, 35.86; H, 3.25; N, 4.18. found: C, 35.86; H, 3.16; N, 4.15. ESI MS (H₂O) m/z 563 (M⁺-1). ¹H NMR (D₂O, 300 MHz): δ=8.54-6.99 (m, 6H), 6.87 (t, J=5.7 Hz, 1H), 3.40 (s, 2H), 3.36 (t, J=12.3 Hz, 2H), 1.52 (s, 6H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.7. ¹⁹F NMR (CDCl₃, 282.3 MHz): δ=−112.0 (d, J=9.3 Hz).

Example 84

Example 84 was synthesized following the general synthetic procedures of Example 26 starting from 4-formyl-2-methoxyphenyl isopropyl carbonate.

trans-Isomer, yield: 0.93 g (15%). Elemental analysis (%) calculated for C₁₉H₂₁NNa₂O₁₁P₂.0.5NaCl.2.6H₂O (623.39): C, 36.61; H, 4.24; N, 2.25. found C, 36.54; H, 4.53; N, 2.15. ESI MS (CH₃CN): m/z 502 (100), 503 (22) calculated m/z 503.34. ¹H NMR (D₂O, 300 MHz): δ=1.32 (d, 3H, J=6.3 Hz), 3.34 (t, 2H, J=17.2 Hz), 3.83 (s, 3H), 4.91 (sept, 1H, J=5.9 Hz), 6.38 (t, 1H, J=5.4 Hz), 6.87 (m, 2H), 7.13 (d, 1H, J=8.1 Hz), 7.37 (m, 1H), 8.14 (m, 1H, J=8.1 Hz), 8.34 (d, 1H, J=5.1 Hz), 8.71 (s, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.57.

cis-Isomer: yield 0.62 g (10%). Elemental analysis (%) calculated for C₁₉H₂₁NNa₂O₁₁P₂.0.5NaCl.2.5H₂O (621.59): C, 36.71; H, 4.22; N, 2.25. found C, 36.45; H, 4.38; N, 2.22. ESI MS (CH₃CN): m/z 502 (100), 503 (23) calculated m/z 503.34. ¹H NMR (D₂O, 300 MHz): δ=1.33 (d, 3H, J=6.3 Hz), 3.38 (t, 2H, J=12.3 Hz), 3.85 (s, 3H), 4.43 (sept, 1H, J=6.0 Hz), 6.54 (t, 1H, J=4.8 Hz), 7.21 (m, 2H), 7.43 (m, 2H), 8.02 (m, 1H, J=7.5 Hz), 8.39 (m, 1H), 8.54 (s, 1H). ³¹P NMR (D₂O, 121.5 MHz): 16.08.

Example 85

Example 85 was synthesized following the general synthetic procedures of Example 26 starting from (S)-4-formylphenyl 2-(acetoxymethyl)pyrrolidine-1-carboxylate (Example 17).

Yield: 856 mg (29%). Elemental analysis (%) calculated for C₂₂H₂₄N₂Na₂O₁₁P₂.2.5H₂O (645.42): C, 40.94; H, 4.53; N, 4.34. found: C, 40.93; H, 4.47; N, 4.31. ESI MS (H₂O): m/z 555 (M⁺-1). ¹H NMR (D₂O, 300 MHz): δ=8.73-7.12 (m, 8H), 6.59-6.42 (m, 1H), 4.40-4.12 (m, 3H), 3.64-3.30 (m, 4H), 2.06-1.85 (m, 7H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.8, 16.5.

Example 86

Example 86 was synthesized following the general synthetic procedures of Example 26 starting from (S)-3,5-difluoro-4-formylphenyl 2-(acetoxymethyl)pyrrolidine-1-carboxylate (Example 18).

Yield: 87 mg (3%). Elemental analysis (%) calculated for C₂₂H₂₂F₂N₂Na₂O₁₁P₂.1.8NaCl.3.3H₂O (801.03): C, 32.99; H, 3.60; N, 3.50. found: C, 32.96; H, 3.75; N, 3.42. ESI MS (H₂O) m/z 591 (M⁺-1). ¹H NMR (D₂O, 300 MHz): δ=8.66-6.80 (m, 7H), 4.36-4.12 (m, 3H), 3.57-3.25 (m, 4H), 2.06-1.87 (m, 7H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.8, 16.7. ¹⁹F NMR (CDCl₃, 282.3 MHz): δ=−112.8.

Example 87

Example 87 was synthesized following the general synthetic procedures of Example 26 starting from 2-fluoro-4-formylphenyl 2-oxooxazolidine-3-carboxylate.

trans-Isomer: yield 0.267 g (12%). ¹H NMR (D₂O): δ=8.76 (s, 1H), 8.42 (d, J=4.0 Hz, 1H), 8.19 (d, J=7.5 Hz, 1H), 7.45 (dd, J=4.0, 7.5 Hz, 1H), 7.36 (t, J=8.1 Hz, 1H), 7.15 (m, 2H), 6.45 (t, J=4.8 Hz, 1H), 4.59 (t, J=8.25 Hz, 2H), 4.30 (t, J=8.25 Hz, 2H), 3.41 (t, J=17.2 Hz, 2H). ³¹P NMR (D₂O): δ=16.45. ¹⁹F NMR (D₂O): δ=−129.192. LC-MS (ESI) for C₁₈H₁₇FN₂O₁₁P₂ m/z 517 [M-H]⁻. Elemental analysis (%) calc. for C₁₈H₁₅FN₂Na₂O₁₁P₂.3H₂O (%): C, 35.08; H, 3.43; N, 4.55. found (%): C, 35.49; H, 3.63; N, 4.20.

cis-Isomer: yield 0.302 g (14%). ¹H NMR (D₂O): δ=8.64 (s, 1H), 8.49 (m, 1H), 8.19 (d, J=8.1 Hz, 1H), 7.66-7.37 (m, 4H), 6.60 (t, J=4.5 Hz, 1H), 4.59 (t, J=8.2 Hz, 2H), 4.30 (t, J=8.2 Hz, 2H), 3.46 (t, J=12.6 Hz, 2H). ³¹P NMR (D₂O): δ=16.61. ¹⁹F NMR (D₂O): δ=−129.084. LC-MS (ESI) for C₁₈H₁₇FN₂O₁₁P₂ m/z 517 [M-H]⁻. Elemental analysis (%) calc. for C₁₈H₁₅FN₂Na₂O₁₁P₂.2.5H₂O.1.5NaCl (%): C, 31.11; H, 2.90; N, 4.03. found (%): C, 31.53; H, 3.17; N, 3.96.

Example 88

Example 88 was synthesized following the general synthetic procedures of Example 26 starting from 2-chloro-4-formylphenyl 2-phenylacetate.

Yield: 0.29 g (4%). Elemental analysis (%) calculated for C₂₂H₁₈NNa₂ClO₉P₂.1.3NaCl.3.5H₂O.0.2CH₃CN (731.04): C, 36.80; H, 3.53, N, 2.30. found C, 36.56; H, 3.26; N, 2.55. ESI MS (CH₃CN): m/z 538 (100), 540 (47) calculated m/z 539.81. ¹H NMR (D₂O, 300 MHz): δ=3.38 (t, 2H, J=11.0 Hz), 3.40 (s, 1H), 6.50 (m, 2H), 7.26 (m, 1H), 7.41 (m, 7H), 7.72 (m, 1H), 8.03 (m, 1H), 8.42 (m, 1H), 8.55 (s, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.53.

Example 89

Example 89 was synthesized following the general synthetic procedures of Example 26 starting from 3-fluoro-4-formylphenyl 2-oxooxazolidine-3-carboxylate (Example 19).

Yield: 370 mg (13%). Elemental analysis (%) calculated for C₁₈H₁₅F₁N₂Na₂O₁₁P₂.2.1H₂O (600.10): C, 36.03; H, 3.22; N, 4.67. found: C, 36.17; H, 3.43; N, 4.81. ESI MS (H₂O): m/z 517 (M⁺-1). ¹H NMR (D₂O, 300 MHz): δ=8.70-7.02 (m, 7H), 6.80-6.60 (m, 1H), 4.53-4.47 (m, 2H), 4.21-4.10 (m, 2H), 3.42-3.28 (m, 2H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.7, 16.5. ¹⁹F NMR (CDCl₃, 282.3 MHz): δ=−116.1, −116.7.

Example 90

Example 90 was synthesized following the general synthetic procedures of Example 26 starting from 2-formylphenyl acetate.

Yield 330 mg (10%); cis and trans isomers. ¹H NMR (D₂O, 300 MHz): δ=8.73 (s, 1H), 8.37 (d, 1H), 8.25 (d, 1H), 8.10 (m, 1H) 7.59-7.13 (m, 4H), 6.59 (t, 1H), 3.36 (m, 2H), 2.36 (s, 3H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.003. MS (M-1) m/z: 428. Elemental analysis (%) calculated for C₁₇H₁₉NO₁₀P₂Na₂.2.0H₂O.0.75NaCl (508.5): C, 34.62; H, 3.81; N, 2.52. found: C, 34.37; H, 4.03; N, 2.48.

Example 91

Example 91 was synthesized following the general synthetic procedures of Example 26 starting from 4-formylphenyl 4,4-dimethyl-2-oxopyrrolidine-1-carboxylate.

Yield 0.135 g (13%) of title compound as white solid, mixture of cis (59%) and trans (41%) isomers. ¹H NMR (D₂O): δ=8.71 (s, 0.41H-trans), 8.55 (s, 0.59H-cis), 8.41 (d, J=4.8 Hz, 0.59H-cis), 8.37 (d, J=5.1 Hz, 0.41H-trans), 8.10 (d, J=7.5 Hz, 0.41H-trans), 7.96 (d, J=8.1 Hz, 0.59H-cis), 7.70 (d, J=8.4 Hz for AB-system, 1.18H-cis), 7.46-7.18 (m, 3.82H-trans,cis), 6.60 (t, J=5.1 Hz, 0.59H-cis), 6.43 (t, J=4.9 Hz, 0.41H-trans), 3.97 (t, J=6.9 Hz, 2H), 3.36 (m, 2H), 2.02 (t, J=6.9 Hz, 2H), 1.23 (s, 6H). ³¹P NMR (D₂O): δ=16.81-cis, 16.50-trans. LC-MS (ESI) for C₂₁H₂₄N₂O₁₀P₂ m/z 525 [M-H]⁻. Elemental analysis (%) calculated for C₂₁H₂₂N₂Na₂O₁₀P₂.4H₂O (%): C, 39.26; H, 4.71; N, 4.36. found (%): C, 38.92; H, 4.55; N, 4.03.

Example 92

Example 92 was synthesized following the general synthetic procedures of Example 26 starting from 2-formyl-4-methylphenyl 2-oxooxazolidine-3-carboxylate (Example 20).

cis-Isomer yield: 313 mg (7%). Elemental analysis (%) calculated for C₁₉H₁₈N₂Na₂O₁₁P₂.2.1H₂O (596.14): C, 38.28; H, 3.75; N, 4.70. found: C, 38.23; H, 3.84; N, 4.84. ESI MS (H₂O): m/z 513 (M⁺-1). ¹H NMR (D₂O, 300 MHz): δ=8.79-7.16 (m, 7H), 6.67 (t, J=5.4 Hz, 1H), 4.60 (t, J=7.5 Hz, 2H), 4.39 (t, J=7.5 Hz, 2H), 3.56 (t, J=11.7 Hz, 2H), 2.38 (s, 3H). ³¹P NMR (D₂O, 121.5 MHz): δ=15.3.

Example 93

Example 93 was synthesized following the general synthetic procedures of Example 26 starting from 2-formyl-6-methoxyphenyl methyl carbonate.

Yield 290 mg (8%), cis and trans isomers. ¹H NMR (D₂O, 300 MHz): δ 8.70 (s, 1H), 8.4 (m, 2H), 7.75 (d, J=8.1 Hz, 1H), 7.25 (m, 2H), 7.15 (m, 1H), 6.46 (m, 1H), 4.87 (m, 1H), 3.78 (s, 3H), 3.73 (s, 3H), 3.25 (m, 2H). ³¹P NMR δ(D₂O, 121.5 MHz): δ=15.699. MS (M-1) m/z: 474. Elemental analysis (%) calculated for C₁₇H₁₉NO₁₁P₂Na₂.2.0H₂O.0.5 NaCl (584): C, 34.81; H, 3.95; N, 2.39. found: C, 34.41; H, 3.95; N, 2.37.

Example 94

Example 94 was synthesized following the general synthetic procedures of Example 26 starting from ethyl 2-formyl-4-methoxyphenyl carbonate.

Yield 272.5 mg (5%) as the disodium salt.4.5H₂O. Elemental analysis (%) calculated for C₁₈H₁₉NNa₂O11P₂.4.5H₂O: C, 35.19; H, 4.59, N, 2.28. found: C, 35.07; H, 4.28; N, 2.31. ¹H NMR (D₂O): δ=1.20 (m, 3H), 3.27 (t, 2H), 3.71 (s, 3H), 4.20 (m, 2H), 6.39 (s, 1H), 6.66 (s, 1H), 6.9 (m, 1H), 7.0 (m, 1H), 7.38 (m, 1H), 8.11 (m, 1H), 8.28 (m, 1H), 8.59 (s, 1H). ³¹P NMR δ=16.573 (˜5%), 16.003 (˜95%). MS (ESI): m/e 488 (M-H⁺).

Example 95

Example 95 was synthesized following the general synthetic procedures of Example 26 starting from 2-formyl-4-methoxyphenyl methyl carbonate.

Yield: 226 mg (6.5%); cis and trans isomers; ¹H NMR (D₂O, 300 MHz): δ=8.65 (s, 1H), 8.52 (m, 2H), 7.85 (d, J=8.1 Hz, 1H), 7.25 (m, 2H), 7.15 (m, 1H), 6.46 (m, 1H), 4.87 (m, 1H), 3.77 (s, 3H), 3.71 (s, 3H), 3.37 (m, 2H). ³¹P NMR (D₂O, 121.5 MHz): δ=15.503, 15.415. MS (M-1) m/z: 474. Elemental analysis (%) calculated for C₁₇H₁₉NO₁₁P₂Na₂ ^(˜)2.0H₂O.0.6NaCl.6% risedronate (637.92): C, 34.34; H, 3.91; N, 2.44. found: C, 34.23; H, 4.25; N, 2.78.

Example 96

Example 96 was synthesized following the general synthetic procedures of Example 26 starting from 4-formylphenyl isopropyl carbonate (Example 2).

Yield: 485 mg (12%). Elemental analysis (%) calculated for C₁₈H_(p9)N₁Na₂O₁₀P₂.3.3H₂O (576.75): C, 37.49; H, 4.47; N, 2.43. found: C, 37.56; H, 4.82; N, 2.57. ESI MS (H₂O): m/z 472 (M⁺-1). ¹H NMR (D₂O, 300 MHz): δ=8.61-7.06 (m, 8H), 6.48-6.30 (m, 1H), 4.80 (m, 1H), 3.32-3.20 (m, 2H), 1.22 (d, J=6.3 Hz, 6H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.7, 16.4.

Example 97

Example 97 was synthesized following the general synthetic procedures of Example 26 starting from 4-formylphenyl pivalate.

cis-Isomer yield: 100 mg (2%). Elemental analysis (%) calculated for C₁₉H₂₁N₁Na₂O₉P₂.0.9NaCl.2.5H₂O (612.97): C, 37.23; H, 4.28; N, 2.29. found: C, 37.15; H, 4.30; N, 2.37. ESI MS (H₂O): m/z 470 (M⁺-1). ¹H NMR (D₂O, 300 MHz): δ=8.41-7.04 (m, 8H), 6.47 (br, 1H), 3.25 J=12.3 Hz, 2H), 1.21 (s, 9H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.8.

Example 98

Example 98 was synthesized following the general synthetic procedures of Example 26 starting from 2-formyl-4-methoxyphenyl 2-oxooxazolidine-3-carboxylate.

Yield: 0.81 g (13.0%). Elemental analysis (%) calculated for C₁₉H₁₈N₂Na₂O₁₂P₂.0.1NaCl.4.2H₂O (628.47): C, 34.80; H, 4.06; N, 4.27. found C, 35.09; H, 4.37; N, 3.76. ESI MS (CH₃CN): m/z 529 (100), 530 (23) calculated m/z 530.33. ¹H NMR (D₂O, 300 MHz): δ=3.31 (m, 6H), 3.62 (s, 1H), 3.67 (s, 1H), 4.21 (m, 4H), 4.42 (m, 2H), 6.45 (t, 1H, J=5.5 Hz), 6.65 (t, 1H, J=4.8 Hz), 6.73 (m, 4H), 7.07 (m, 2H), 7.50 (m, 2H), 8.11 (m, 2H), 8.34 (m, 2H), 8.49 (m, 2H). ³¹P NMR (D₂O, 121.5 MHz): δ=15.99 (trans), 16.37 (cis).

Example 99

Example 99 was synthesized following the general synthetic procedures of Example 26 starting from cyclopentyl 2-formyl-4-methoxyphenyl carbonate.

Yield 230 mg (10%); a mixture of cis and trans isomers. ³¹P NMR (D₂O, 121.5 MHz): δ=15.725. MS (M-1) m/z 529. Elemental analysis (%) calculated for C₂₁H₂₅N₁O₁₁P₂Na₂.2.5H₂O (618): C, 40.66; H, 4.87; N, 2.26. found: C, 40.66; H, 4.87; N, 2.26.

Example 100

Example 100 was synthesized following the general synthetic procedures of Example 26 starting from cyclobutyl 2-formyl-4-methylphenyl carbonate.

trans-Isomer: yield 170 mg (3%). ¹H NMR (D₂O, 300 MHz): δ=8.41 (s, 1H), 8.10 (m, 1H), 7.89 (d, J=9.9 Hz, 1H), 7.15 (m, 2H), 6.95 (d, J=8.4 Hz, 1H), 6.74 (d, J=8.1 Hz, 1H), 6.55 (s, 1H), 6.17 (t, 1H), 4.68 (m, 1H), 3.06 (t, 2H, J=17.1 Hz), 1.90 (s, 3H), 2.02-1.84 (m, 4H), 1.45 (m, 1H), 1.29 (m, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=15.829. MS (M-1) m/z: 498. Elemental analysis (%) calculated for C₂₀H₂₃N₁O₁₀P₂Na₂.2H₂O (579): C, 41.32; H, 4.66; N, 2.41. found: C, 41.18; H, 4.66; N, 2.74.

cis-Isomer: yield 136 mg (2.2%). ¹H NMR (D₂O, 300 MHz): δ=8.31 (s, 1H), 8.16 (d, 1H), 7.91 (d, J=7.8 Hz, 1H), 7.34 (m, 2H), 7.26 (s, 1H), 6.98 (d, J=9.0 Hz, 1H), 6.77 (d, J=8.1 Hz, 1H), 6.32 (t, 1H), 4.69 (m, 1H), 3.10 (t, 2H, J=12.6 Hz), 1.99 (s, 3H), 2.02-1.84 (m, 4H), 1.51 (m, 1H), 1.30 (m, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=15.589. MS (M-1) m/z: 498. Elemental analysis (%) calculated for C₂₀H₂₃N₁O₁₀P₂Na₂.2H₂O (579): C, 41.32; H, 4.66; N, 2.41. found: C, 41.44; H, 4.52; N, 2.68.

Example 102

Example 102 was synthesized following the general synthetic procedures of Example 26 starting from cyclohexyl 2-formylphenyl carbonate.

trans-Isomer, yield: 579 mg (8%). ¹H NMR (D₂O, 300 MHz): δ=8.39 (s, 1H), 8.08 (d, 1H), 7.95 (d, J=8.1 Hz, 1H), 7.23-7.13 (m, 2H), 7.12-6.87 (m, 3H), 6.24 (t, 1H), 4.45 (buried under D₂O, m, 1H), 3.08 (t, 2H, J=15.9 Hz), 1.70-1.50 (m, 3H), 1.5-0.96 (m, 8H). ³¹P NMR (D₂O, 121.5 MHz): δ=15.715. MS (M-1) m/z: 512. Elemental analysis (%) calculated for C₁₇H₁₉NO₁₁P₂Na₂.2.0H₂O (593): C, 42.62; H, 4.87; N, 2.37. found: C, 42.33; H, 4.48; N, 2.41.

cis-Isomer, yield: 434 mg (6%). ¹H NMR (D₂O, 300 MHz): δ=8.25 (s, 1H), 8.11 (d, 1H), 7.77 (d, J=7.8 Hz, 1H), 7.45 (d, 1H), 7.21-7.16 (m, 2H), 7.09 (d, 1H), 6.92 (d, 1H), 6.38 (t, 1H), 4.45 (buried under D₂O, m, 1H), 3.07 (t, 2H, J=12.9 Hz), 1.72-1.58 (m, 3H), 1.40-0.84 (m, 10H). ³¹P NMR (D₂O, 121.5 MHz): δ=15.745. MS (M-1) m/z 512. Elemental analysis (%) calculated for C₂₀H₂₃NO₁₀P₂Na₂.2.0H₂O.0.3NaCl.0.1CH₃CN (611): C, 41.27; H, 4.79; N, 2.50. found: C, 41.07; H, 4.52; N, 2.79.

Example 103

Example 103 was synthesized following the general synthetic procedures of Example 26 starting from 4-formylphenyl 3,3-dimethylbutanoate.

Yield: 220 mg (8%). Mixture of isomers with a ratio of 65:35. ¹H NMR (D₂O): δ=1.08 (9H, s), 2.50 (2H, s), 3.33-3.47 (2H, m), 6.50-6.56 (1H, m), 7.11-7.38 (3H, m), 7.64-7.68 (1H, m), 7.94-8.69 (4H, m). ³¹P NMR (D₂O): δ=16.59 and 16.91 (1.00:0.35). Elemental analysis: found C, 39.98%; H, 4.89%; N, 2.45%; calculated for C₂₀H₂₃NCl_(0.2)Na_(2.2)O₉P₂(H₂O)_(3.3) C, 40.00%; H, 4.97%; N, 2.33%. LC-MS: (M-1) m/z found 484; calculated for C₂₀H₂₅NO₉P₂ 485.37.

Example 104

Example 104 was synthesized following the general synthetic procedures of Example 26 starting from 2-(((4-formylphenoxy)carbonyl)(methyl)amino)ethyl acetate (Example 21).

Yield: 972 mg (34%). Elemental analysis (%) calculated for C₂₀H₂₂N₂Na₂O₁₁P₂.2.1H₂O (612.18): C, 39.24; H, 4.31; N, 4.58. found: C, 39.27; H, 4.47; N, 4.51. ESI MS (H₂O): m/z 529 (M⁺-1). ¹H NMR (D₂O, 300 MHz): δ=8.70-7.06 (m, 8H), 6.58-6.38 (m, 1H), 4.31-4.29 (m, 2H), 3.72-3.58 (m, 2H), 3.42-3.31 (m, 2H), 3.10-2.97 (2 singlets, 3H), 2.06 (s, 3H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.8, 16.5.

Example 105

Example 105 was synthesized following the general synthetic procedures of Example 26 starting from 2-formylphenyl butyrate.

trans-Isomer, yield: 0.52 g (8.8%). Elemental analysis (%) calculated for C₁₈H₁₉NNa₂O₁₀P₂.0.09NaCl.1.5H₂O (591.62): C, 40.60; H, 4.09; N, 2.37. found C, 40.54; H, 4.07; N, 2.32. ESI MS (CH₃CN): m/z 456 (100), 457 (20) calculated m/z 457.32. ¹H NMR (D₂O, 300 MHz): δ=0.95 (t, 3H, J=6.6 Hz), 1.67 (d, 2H, J=7.2 Hz), 2.65 (d, 2H, J=6.9 Hz), 3.35 (t, 2H, J=16.3 Hz), 6.48 (t, 1H, J=4.5 Hz), 7.07 (m, 1H), 7.28 (m, 2H), 7.47 (m, 2H), 8.24 (m, 1H), 8.35 (m, 1H), 8.61 (s, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.10.

Example 106

Example 106 was synthesized following the general synthetic procedures of Example 26 starting from 2-formylphenyl 3-methylbutanoate.

Yield: 0.58 g (10.0%), trans and cis isomers. Elemental analysis (%) calculated for C₁₉H₂₁NNa₂O₉P₂.0.7NaCl.1.3H₂O (579.66): C, 39.37; H, 4.10, N, 2.42. found C, 39.26; H, 4.38; N, 2.58. ESI MS (CH₃CN): m/z 470 (100), 471 (20) calculated m/z 471.34. ¹H NMR (D₂O, 300 MHz): δ=1.00 (d, 6+6H, J=6.0 Hz), 2.13 (m, 1+1H, J=6.6 Hz), 2.5 (m, 2+2H), 3.44 (m, 2+2H, J=15.9, 12.1 Hz), 6.51 (t, 1H, J=4.3 Hz), 6.62 (t, 1H, J=4.8 Hz), 7.14 (m, 2H), 7.32 (m, 4H), 7.45 (m, 4H), 7.81 (m, 2H), 8.49 (s, 1H), 8.58 (s, 1H), 8.76 (s, 1H), 8.78 (s, 1H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.24, 16.20.

Example 107

Example 107 was synthesized following the general synthetic procedures of Example 26 starting from 4-formylphenyl dimethylcarbamate.

Yield: 518 mg (14%); elemental analysis (%) calcd for C₁₇H₁₇F₁N₂Na₂O₉P₂.1.0NaCl.2.0H₂O (614.76): C, 33.21; H, 3.44; N, 4.56. found: C, 33.20; H, 3.64; N, 4.49; ESI MS (H₂O): m/z: 475 (M⁺-1). ¹H NMR (D₂O; 300 MHz): δ=8.71-6.97 (m, 7H), 6.55-6.37 (m, 1H), 3.42-3.30 (m, 2H), 3.11 (s, 3H), 2.96 (s, 3H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.8, 16.5. ¹⁹F NMR (CDCl₃, 282.3 MHz): δ=−130.0.

Example 108

Example 108 was synthesized following the general synthetic procedures of Example 26 starting from 2-formyl-4-methoxyphenyl pivalate.

Elemental analysis (%) calcd C₂₀H₂₃NNa₂O₁₀P₂.4 H₂O: C, 38.91; H, 5.06; N, 2.27. Found: C, 38.75; H, 4.93; N, 2.18. ¹H NMR (D₂O), δ 1.223 (s, 9H), 3.241 (t, 3H, J_(PH)=16.5 Hz), 3.694 (s, 3H), 6.32 (t, 1H, J=5 Hz), 6.66 (s, 1H), 6.86 (m, 2H), 7.38 (m, 1H), 8.14 (d, J=7.8 Hz), 8.27 (m, 1H), 8.60 (m, 1H). ³¹P NMR δ=15.822. MS (ESI): m/e 500 (m-H⁺).

Example 109

Example 109 was synthesized following the general synthetic procedures of Example 26 starting from 2-formylphenyl pivalate.

Trans isomer Yield: 105 mg. Elemental analysis (%) calcd for C₁₉H₂₁N₁O₉P₂Na₂ 2.0H₂O C, 41.39; H, 4.57; N, 254%. found C, 41.67; H, 4.51; N, 2.55; ESI MS (H₂O): m/z 470 (M⁻1). ¹H NMR (D₂O; 300 MHz): δ=8.75 (s, 1H), 8.58 (m, 1H), 8.43 (s, 1H), 7.80 (m, 1H), 7.43 (m, 1H), 7.30 (m, 2H), 7.00 (m, 1H), 6.40 (s, 1H), 3.37 (t, J=15.0 Hz, 2H), 1.30 (s, 9H). ³¹P NMR (D₂O, 121.5 MHz): δ=15.35.

Example 110

Example 110 was synthesized following the general synthetic procedures of Example 26 starting from cyclopentyl 2-formyl-4-methylphenyl carbonate.

Trans isomer 260 mg. Elemental analysis (%) calcd for C₂₁H₂₅N₁O₁₀P₂Na₂.2.5H₂O (604.4): C, 41.73; H, 5.00; N, 2.32. found: C, 41.88; H, 5.15; N, 2.35. ¹H NMR (D₂O; 300 MHz): δ=8.78, (s, 1H), 8.47 (m, 1H), 8.33 (d, 1H), 7.58 (m, 1H), 7.32 (1, 1H), 7.10 (t, 1H), 7.01 (s, 1H), 6.52 (t, 1H), 5.21 (m, 1H), 3.43 (t, 2H, J=17.1 Hz), 2.35 (s, 3H), 1.95-1.45 (m, 8H). m/z 512.

Example 111

Example 111 was synthesized following the general synthetic procedures of Example 26 starting from 1-formylnaphthalen-2-yl isopropyl carbonate.

Yield: 201 mg, trans isomer. ¹H NMR (D₂O), δ=1.18 (d, 6H), 3.47 (t, 2H, J_(PH)=14.1 Hz), 4.85 (m, 1H), 7.13 (m, 2H), 7.41 (m, 2H), 7.65-7.83 (m, 3H), 8.13 (d, 1H), 8.35 (d, 1H), 8.44 (d, 1H), 8.66 (s, 1H). Anal Calcd for C₂₂H₂₁NNa₂O₁₀P₂: C, 46.57; H, 3.73; N, 2.47. Found: C, 46.52; H, 3.98; N, 2.40. MS (ESI): m/e 522 (m-H⁺).

Example 112

Example 112 was synthesized following the general synthetic procedures of Example 26 starting from isopropyl 4-formyl-1-naphthoate.

Yield: 685 mg of a mixture of (100:4) trans-isomer: cis-isomer. Anal Calcd for C₂₂H₂₁NNa₂O₁₀P₂.2.4 H₂O: C, 43.25; H, 4.26; N, 2.29. Found: C, 43.17; H, 3.83; N, 2.57. ¹H NMR (D₂O), δ=1.26 (m, 6H), 3.41 (m, ˜2H), 4.9 (m, ˜1H), 7.0-8.6 (m, ˜10H). ³¹P NMR (D₂O) δ 16.353, 16.239. MS (ESI): m/e 522 (m-H⁺).

Example 113

Example 113 was synthesized following the general synthetic procedures of Example 26 starting from 2-formylphenyl 3-acetoxy-2,2-dimethylpropanoate.

Yield: 65.7 mg as the disodium salt.0.5 H₂O, ˜95:5 cis-isomer: trans-isomer. Anal. Calcd for C₁₈H₁₉NNa₂O11P₂.4.5H₂O: C, 43.31; H, 4.15; N, 2.41. Found: C, 43.19; H, 4.28; N, 2.36. ¹H NMR (D₂O), δ=1.4 (m, 6H), 2.14 (m, 3H), 3.36 (m, 2H), 4.32 (s, 2H), 6.66 (m, 1H), 7.08 (d, 1H), 7.5 (m, 2H), 7.82 (d, 1H), 7.95 (d, 1H), 8.40 (m, 1H), 8.53 (s, 1H). ³¹P NMR δ=16.347 (˜5.5%), 16.151 (˜94.5%). MS (ESI): m/e 528 (m-H⁺).

Example 114

Example 114 was synthesized following the general synthetic procedures of Example 26 starting from cyclohexyl 2-formyl-4-methoxyphenyl carbonate.

Elemental analysis (%) calcd for C₂₁H₂₅N₁O₁₀P₂Na₂.1.5H₂O (616.4): C, 42.87; H, 4.91; N, 2.27. found: C, 42.97; H, 4.99; N, 2.27. ¹H NMR (D₂O; 300 MHz) δ=8.58 (s, 1H), 8.35 (d, 1H), 8.23 (1H), 7.56 (m, 1H), 6.84 (d, 1H), 6.73 (s, 1H), 6.63 (d, 1H), 6.20 (t, 1H), 4.45 (buried under D₂O, m, 1H), 3.52 (s, 3H), 3.22 (t, 2H, J=15.9 Hz), 1.70-1.50 (m, 3H), 1.5-0.96 (m, 8H). ³¹PNMR δ (D₂O, 121.5 MHz):15.18. ESI m/z 542 (M-1).

Example 115

Example 115 was synthesized following the general synthetic procedures of Example 26 starting from 4-chloro-2-formylphenyl isopropyl carbonate.

Yield: 195 mg. Elemental analysis (%) calcd for C₁₈H₂₀N₁O₁₀P₂Na₂.1.5H₂O.0.3NaCl (602.4): C, 36.29; H, 3.90; N, 2.56. found: C, 36.15; H, 3.54; N, 2.34. ¹H NMR (D₂O; 300 MHz) δ=8.41 (s, 1H), 8.11 (d, 1H), 7.89 (1H), 7.14 (m, 3H), 7.02 (s, 1H), 6.86 (d, 1H), 6.70 (d, 1H), 6.17 (t, 1H), 4.65 (m, 1H), 3.05 (t, 2H), 1.01 (d, 6H). ³¹PNMR (D₂O, 121.5 MHz): δ=15.03. ESI m/z 506 (M-1).

Example 116

Example 116 was synthesized following the general synthetic procedures of Example 26 starting from (2-formyl-5-(trifluoromethyl)phenoxy)methyl isopropyl carbonate.

Trans isomer: yield: 259 mg (3.5%); elemental analysis (%) calcd for C₂₀H₂₀N₁Na₂O₁₁F₃P₂ (615.32): C, 39.04; H, 3.28; N, 2.28. found: C, 39.24; H, 3.57; N, 1.95; ESI MS (H₂O): m/z: 570 (M⁺-1). ¹H NMR (D₂O; 300 MHz): δ=8.82-7.22 (m, 7H), 6.75-6.73 (m, 1H), 5.87 (s, 2H), 5.0-4.8 (m, 1H), 3.45 (t, J=17.1 Hz, 2H), 1.27 (m, 6H). ³¹P NMR (D₂O, 121.5 MHz): δ=15.9. ¹⁹F NMR (CDCl₃, 282.3 MHz): δ=−63.5.

Example 117

Example 117 was synthesized following the general synthetic procedures of Example 26 starting from 3-formylbiphenyl-2-yl isopropyl carbonate.

Yield: 400 mg, trans-isomer. Elemental analysis (%) calcd for C₂₄H₂₃NO₁₀P₂Na₂.2.0H₂O.0.4 NaCl (656.91): C, 44.25; H, 4.19; N, 2.35. found: C, 43.97; H, 4.57; N, 2.22. ¹HNMR (D₂O; 300 MHz) δ=8.36 (s, 1H), 8.10-8.06 (m, 1H), 7.85 (d, 1H), 7.15 (m, 8H), 6.92 (d, 1H), 6.29 (t, 1H), 3.05 (t, 2H), 0.68 (d, 6H). ³¹PNMR (D₂O, 121.5 MHz): δ=15.87. ESI m/z 548 (M-1).

Example 118

Example 118 was synthesized following the general synthetic procedures of Example 26 starting from 4-chloro-2-formylphenyl 2-oxooxazolidine-3-carboxylate.

Yield: 120 mg Trans isomer Elemental analysis (%) calcd for C₁₈H₁₅ClN₂O₁₁P₂Na₂.2.5H₂O (635.78): C, 34.95; H, 3.36; N, 4.41. found: C, 35.14; H, 3.64; N, 4.14. ¹HNMR (D₂O; 300 MHz) δ=8.40 (s, 1H), 8.11 (m, 1H), 7.96 (d, 1H), 7.16 (m, 3H), 6.86 (d, 1H), 6.78 (s, 1H), 6.16 (t, 1H), 4.21 (t, 2H), 3.99 (t, 2H), 3.04 (t, 2H, J=16.8 Hz). ³¹PNMR (D₂O, 121.5 MHz): δ=15.51. ESI m/z 533 (M-1).

Example 119

Example 119 was synthesized following the general synthetic procedures of Example 26 starting from 3-formylbiphenyl-4-yl isopropyl carbonate.

Yield: 200 mg, trans-isomer. Elemental analysis (%) calcd for C₂₄H₂₃NO₁₀P₂Na₂.0.8 H₂O (611.91): C, 47.50; H, 4.10; N, 2.52. found: C, 47.69; H, 4.23; N, 2.37. ¹HNMR (D₂O; 300 MHz) δ=8.47 (s, 1H), 8.26 (m, 1H), 7.79 (m, 1H), 7.31-7.15 (m, 8H), 6.96 (d, 1H), 6.27 (t, 1H), 3.13 (t, 2H), 1.04 (d, 6H). ³¹PNMR (D₂O, 121.5 MHz): δ=15.10. ESI m/z 548 (M-1).

Example 120

Example 120 was synthesized following the general synthetic procedures of Example 26 starting from cyclobutyl 4-formyl-2-methoxyphenyl carbonate.

Yield: 152 mg; trans-isomer. Elemental analysis (%) calcd for C₂₀H₂₄NO₁₁P₂Na₂.0.4H₂O.0.1MeCN.0.1 risedronate (600.97): C, 41.77; H, 4.23, N, 2.80. found: C, 42.08; H, 4.59; N, 2.50. ¹HNMR (D₂O; 300 MHz) δ=8.52 (s, 1H), 8.38 (m, 1H), 8.21 (d, 1H), 7.57 (m, 2H), 6.85 (m, 2H), 6.66 (d, J=7.8 Hz, 1H), 6.11 (t, 1H), 4.67 (m, 1H), 3.53 (s, 3H), 3.06 (t, 2H, J=17.1 Hz), 2.02-1.84 (m, 4H), 1.50 (m, 1H), 1.28 (m, 1H). ³¹PNMR (D₂O, 121.5 MHz): δ=15.63. ESI m/z 514 (M-1).

Example 121

Example 121 was synthesized following the general synthetic procedures of Example 26 starting from cyclopentyl 4-formylphenyl carbonate.

Yield: 190 mg; trans-isomer. Elemental analysis (%) calcd for C₂₀H₂₃NO₁₀P₂Na₂.1.0H₂O.0.5NaCl (592.59): C, 40.54; H, 4.25; N, 2.36. found: C, 40.30; H, 4.22; N, 2.50. ¹HNMR (D₂O; 300 MHz) δ=8.38 (s, 1H), 8.06 (d, 1H), 7.87 (d, J=9.9 Hz, 1H), 7.15 (m, 3H), 7.01 (t, 1H), 6.89 (t, 1H), 6.23 (t, 1H), 4.87 (m, 1H), 3.07 (t, 2H, J=16.2 Hz), 1.55-1.28 (m, 8H). ³¹PNMR (D₂O, 121.5 MHz): δ=16.43. ESI m/z 498 (M-1).

Example 122

Example 122 was synthesized following the general synthetic procedures of Example 26 starting from cyclobutyl 4-formylphenyl carbonate.

Yield: 290 mg; trans-isomer. Elemental analysis (%) calcd for C₁₉H₂₁NO₁₀P₂Na₂.1.0H₂O (553.44): C, 41.67; H, 4.24; N, 2.78. found: C, 41.29; H, 4.28; N, 2.39. ¹HNMR (D₂O; 300 MHz) δ=8.45 (s, 1H), 8.15 (m, 1H), 7.95 (d, 1H), 7.15 (m, 2H), 6.95-6.85 (m, 3H), 6.12 (t, 1H), 4.67 (m, 1H), 3.04 (t, 2H, J=17.1 Hz), 2.02-1.84 (m, 4H), 1.45-1.20 (m, 2H). ³¹PNMR δ (D₂O, 121.5 MHz): 16.12. ESI m/z 484 (M-1).

Example 123

Example 123 was synthesized following the general synthetic procedures of Example 26 starting from cyclohexyl 4-formyl-2-methoxyphenyl carbonate.

Trans-isomer: Yield: 423 mg (7.0%); elemental analysis (%) calcd for C₂₂H₂₅N₁Na₂O₁₁P₂.0.1H₂O (600.81): C, 45.18; H, 4.43; N, 2.33. found: C, 45.61; H, 4.96; N, 2.07. ESI MS (H₂O): m/z: 542 (M⁺-1). ¹H NMR (D₂O; 300 MHz): δ=8.79-6.93 (m, 7 H), 6.45 (t, J=5.1 Hz, 1H), 3.89 (s, 3H), 3.43 (t, J=17.6 Hz, 2H), 1.96-1.26 (m, 10H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.1.

Example 124

Example 124 was synthesized following the general synthetic procedures of Example 26 starting from cyclopentyl 4-formyl-2-methoxyphenyl carbonate.

Trans isomer: Yield: 412 mg. Elemental analysis (%) calcd for C₂₁H₂₃N₁Na₂O₁₁P₂.1.2H₂O (594.98): C, 42.39; H, 4.30; N, 2.35. found: C, 42.45; H, 4.55; N, 2.06. ESI MS (H₂O): m/z: 528 (M⁺-1). ¹HNMR (D₂O; 300 MHz): δ=8.77-6.90 (m, 7 H), 6.44 (t, J=4.8 Hz, 1H), 5.20 (broad, 1H), 3.88 (s, 3H), 3.41 (t, J=16.7 Hz, 2H), 1.96-1.55 (m, 8H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.2.

Example 125

Example 125 was synthesized following the general synthetic procedures of Example 26 starting from 2-formyl-4-methoxyphenyl isopropyl carbonate.

Yield: 150 mg; trans-isomer. Elemental analysis (%) calcd for C₁₉H₂₃NO₁₀P₂Na₂.1.0H₂O.0.3NaCl (584.89): C, 39.02; H, 4.31; N, 2.39. found: C, 38.86; H, 4.00; N, 2.00. ¹HNMR (D₂O; 300 MHz) δ=8.36 (s, 1H), 8.03 (d, 1H), 7.82 (1H), 7.07 (m, 1H), 6.74 (d, 1H), 6.64 (d, 1H), 6.42 (m, 1H), 6.17 (t, 1H), 4.62 (m, 1H), 3.50 (s, 3H), 3.02 (t, 2H), 1.00 (d, 6H). ³¹P NMR (D₂O, 121.5 MHz): δ=15.82. ESI m/z 502 (M-1).

Example 126

Example 126 was synthesized following the general synthetic procedures of Example 26 starting from 3-fluoro-4-formylphenyl 3,3-dimethyl-2-oxoazetidine-1-carboxylate.

Yield: trans-isomer, 105 mg (1.8%). Elemental analysis (%) calcd for C₂₀H₁₉F₁N₂Na₂O₁₀P₂ (574.32): C, 41.83; H, 3.33; N, 4.88. found: C, 42.64; H, 3.69; N, 4.67. ESI MS (H₂O): m/z: 529 (M⁺-1). ¹H NMR (D₂O; 300 MHz): δ=8.73-7.06 (m, 7 H), 6.68 (t, J=4.5 Hz, 1H), 3.72 (s, 2H), 3.39 (t, J=17.0 Hz, 2H), 1.41 (m, 6H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.3. ¹⁹F NMR (CDCl₃, 282.3 MHz): δ=−116.6.

Example 127

Example 127 was synthesized following the general synthetic procedures of Example 26 starting from cyclopropyl 2-formylphenyl carbonate.

Yield: trans-isomer: 98 mg (1.9%). Elemental analysis (%) calcd for C₁₈H₁₇N₁Na₂O₁₀P₂.0.3NaCl.1.0H₂O (550.83): C, 39.25; H, 3.48; N, 2.54. found: C, 39.24; H, 3.56; N, 2.41. ESI MS (H₂O): m/z: 470 (M⁺-1). ¹HNMR (D₂O; 300 MHz): δ=8.69-7.23 (m, 8 H), 6.57 (t, J=4.8 Hz, 1H), 4.26 (m, 1H), 3.38 (t, J=16.5 Hz, 2H), 0.94-0.77 (m, 4H). ³¹P NMR (D₂O, 121.5 MHz): δ=16.2.

Example 128

Example 128 was synthesized following the general synthetic procedures of Example 26 starting from 2-formylphenyl isopropyl carbonate.

Yield: 192 mg (3%). Elemental analysis (%) calcd for C₁₆H₁₈N₂Na₂O₁₀P₂.0.5H₂O (515.28): C, 37.30; H, 3.72; N, 5.44. found: C, 37.66; H, 4.09; N, 5.19; ESI MS (H₂O): m/z: 461 (M⁺-1). ¹H NMR (D₂O; 300 MHz): δ=8.70-8.67 (m, 1H), 7.65-7.28 (m, 6H), 6.76-6.65 (m, 1H), 5.10-4.90 (m, 1H), 4.76-4.68 (m, 2H), 1.41-1.38 (m, 6H). ³¹P NMR (D₂O, 121.5 MHz): δ=12.67, 12.45.

Alternatively, Example 128 was synthesized according to the following synthetic procedure:

i) 2-Isopropoxyformoxy benzaldehyde

To a solution of salicylaldehyde (10.39 g, 85.08 mmol) and pyridine (7.57 mL, 1.1 eq.) in dichloromethane (40 mL) in a 250 mL round-bottom flask was added a solution of 1M isopropyl chloroformate in toluene (93.60 mL, 1.1 eq.) slowly in 20 minutes to maintain the internal temperature below −25° C. using a cold bath of dry ice/acetone. White precipitate began to form during the addition and more precipitate was seen after the addition was complete. The mixture was removed from the cold bath and stirred for 2 hours with the application of a slow increase of temperature. Subsequently, the reaction mixture was evaporated to half the volume on a rotary evaporator, diluted with ethyl acetate (50 mL), washed with ice cold water (2×100 mL), 1N NaOH (3×50 mL), ice water (2×50 mL) and cold brine (1×100 mL), dried over anhydrous MgSO₄ and evaporated on a rotary evaporator to produce 15.85 g (88%) of yellow oil. The carbonate (10.52 g) was distilled in high vacuum to yield 9.32 g of colorless oil (b.p. 101-103° C./0.8 torr). ¹H NMR (300 MHz, CDCl₃): δ 10.22 (s, ¹H), 7.92 (dd, J=2.1, 7.5 Hz, ¹H), 7.68 (dt, J=2.1, 7.5 Hz, ¹H),7.47 (t, J=7.5 Hz, ¹H), 7.32 (d, J=7.5 Hz, ¹H), 5.04 (m, 1H), 1.45 (d, J=6.3 Hz, 6H).

The reaction was monitored by TLC analysis. The final step of distillation of the carbonate product is necessary to minimize moisture content therein as the synthesis of 1-tert-Butoxyformoxy-2′-isopropoxyformoxybenzylchloride below is conducted under exclusively anhydrous conditions.

ii) 1-tert-Butoxyformoxy-2′-isopropoxyformoxybenzylchloride

A 50-mL 3-neck round-bottom flask equipped with an argon line, a thermo couple and a rubber septum was charged with 2-Isopropoxyformoxy benzaldehyde (1.680 g, 8.069 mmol) and purged with vacuum-argon for 3 cycles. Freshly distilled THF (16 mL) was added followed by the addition of triphosgene (0.798 g, 1.0 eq. based on phosgene) at 3° C. and then a solution of 1.0M pyridine in THF (0.40 mL, 5 mol %). Freshly obtained triphosgene (Aldrich) was used to ensure high conversion. The mixture turned cloudy after the addition. The resultant mixture was warmed to room temperature over the course of 15 minutes and then heated at 44° C. in an oil bath for 1 hour. The mixture was cooled to −10° C. To it was added a solution of 1.6M tBuOH and 1.6M pyridine in THF (5.55 mL, 1.1 eq.) slowly to maintain the internal temperature <−7° C. The tBuOH, pyridine and THF solution was made in 1.6M concentration and dried and stored with molecular sieves under argon, which had been pre-dried in a drying oven at 145° C. in high vacuum for 2 days.

After the addition, the mixture was stirred and the temperature slowly raised to room temperature over the course of 1 hour. The solid was removed by filtration and rinsed with EtOAc:Hex (1:4). The volatiles were evaporated under reduce pressure to give 1.957 g of yellow thick oil. The intermediate was used for the next step without further purification subsequent to storing in an air moisture free environment freezer. This intermediate was relatively stable for up to 2 weeks when stored this freezer.

¹H NMR showed 3:1 ratio of the substituted benzylchloride vs. the aldehyde starting material.

iii) Drying (1-hydroxy-2-imidazol-1-yl)-ethyl-1,1-bisphosphonic acid (zoledronic acid)

Since the supplied bisphosphonic acid contained hydrates, the water was removed by an azeotropic distillation procedure.

Zoledronic acid hydrate (24.00 g) was suspended in mesitylene (50 mL) in a 100 mL round-bottom flask equipped with a Dean-Stark trap. The suspension was heated at reflux until the distillate was free of water, which took approximately 2 hours and about 2 mL of water was collected. After cooling, the mixture was filtered and the solid was washed with hexane and dried in high vacuum overnight to produce 21.94 g of a white solid, which was stored under argon until further use.

iv) Carbonic acid isopropyl ester 2-(2,3,4-trihydroxy-3-imidazol-1-ylmethyl-2,4-dioxo-2λ⁵,4λ⁵-[1,5,2,4]dioxadiphosphinan-6-yl)-phenyl ester

A 50-mL round bottom flask charged with zoledronic acid (1.098 g, 4.035 mmol) and EtNiPr₂ (2.81 mL, 4.0 eq.) in anhydrous DMF (25 mL) was heated at 42° C. for 15 min (during which n separation occurred) and to it was added a solution of 1-tert-butoxyformoxy-2′-isopropoxyformoxybenzylchloride (1.957 g, crude) in anhydrous DMF (10 mL). The resultant mixture was stirred and maintained at 42° C. for 24 hours as a heterogeneous suspension. A distillation head and a condenser were placed on the flask and the volatiles were distilled in high vacuum at 40° C. (oil bath). The residue was absorbed onto silica gel by mixing with MeOH (10 mL) and silica gel (15 g) followed by evaporation to dryness under high vacuum. This solid was added to a pre-packed column of silica gel (200 g) and eluded with CH₃CN:MeOH (10:0->10:1->4:1->2:1->0:10). The fractions collected were checked by TLC and MS analyses. Two poured fractions showed the product mass after evaporation under reduced pressure gave 80 mg and 170 mg, respectively.

The diacid (0.152 mg) was dissolved in CH₃CN and passed through an ion exchange resin column (containing Amberlite IR-120 (Na) ion exchange resin which had been washed with water before loading) (40 g), eluded with deionized water. The fraction with slight tan color was freeze-dried to give 64 mg of a white fluffy solid. The product showed cis/trans mixture and a strong signal in negative MS-ESI. ³¹P NMR (300 MHz, D₂O): δ 13.85 (s) and 13.51 (s); MS (ESI): 461.0 (M-H⁺).

Example 129

Example 129 was synthesized following the general synthetic procedures of Example 26 starting from 2-formylphenyl isopropyl carbonate.

Yield 0.644 g (24%), white solid. ¹H NMR (D₂O, δ ppm, J Hz): 8.64 (d, ³J_(HH)=7.2, 1H), 7.25-7.90 (m, 8H), 6.71 (t, ³J_(HP)=5.1, 0.5H), 6.68 (t, ³J_(HP)=5.1, 0.5H), 5.02 (m, 1H), 3.45-3.70 (m, 2H), 2.55-2.80 (m, 1H), 1.39 (d, ³J_(HH)=6.3, 3H), 1.38 (d, ³J_(HH)=6.3, 3H). ³¹P NMR (D₂O, δ ppm) 16.05, 15.97 (cis-isomer 84%); 15.77, 15.72 (trans-isomer 16%). LC-MS (ESI) for C₂₀H₂₂N₂O₉P₂ m/z 495 [M-H]⁻. Calc. for C₂₀H₂₀N₂Na₂O₉P₂.2H₂O (%): C, 41.68; H, 4.20; N, 4.86. found (%): C, 41.57; H, 4.62; N, 4.67.

Example 130

Example 130 was synthesized following the general synthetic procedures of Example 26 starting from 2-formylphenyl 2-oxooxazolidine-3-carboxylate.

Yield 0.355 g (15%), white solid. ¹H NMR (D₂O, 8 ppm, J Hz): 8.66 (d, 4.2, 1H), 7.30-7.90 (m, 8H), 6.72 (t, ³J_(HP)=4.2, 1H), 4.60 (t, ³J_(HH)=8.7, 2H), 4.39 (t, ³J_(HH)=8.7, 2H), 3.57 (td, ³J_(HH)=7.5, ³J_(HP)=21.3, 2H), 2.73 (m, 1H). ³¹P NMR (D₂O, δ ppm) 16.57 (cis-isomer 12%); 16.16, 16.10 (trans-isomer 88%). LC-MS (ESI) for C₂₀H₁₉N₃O₁₀P₂ m/z 522 [M-H]⁻. Calc. for C₂₀H₁₇N₃Na₂O₁₀P₂. 1.5H₂O (%): C, 40.42; H, 3.39; N, 7.07. found (%): C, 41.03; H, 3.91; N, 6.56.

Example 131

To a 500 ml dry round bottom flask were added minodronic acid (1.607 g, 4.989 mmol), carbonic acid 2-(tert-butoxycarbonyloxy-chloro-methyl)-phenyl ester isopropyl ester (3.44 g, 9.98 mmol, 2.0 eq.) and iPr₂Net (3.65 mL, 4.0 eq.) in anhydrous CH₃CN (20 mL). The mixture was stirred at 42° C. for 28 hours, at which point it turned to a homogenous brown solution. The solvent was evaporated to ½ of its volume and the remaining content was loaded to a pre-packed silica-gel column eluted with acetonitrile:water (10:0→10:1→10:2→10:3→10:4). Fractions showing product mass were combined and evaporated to ⅓ of its volume. The aqueous phase was passed through a column of Na+ ion-exchange resin and the eluent was lyophilized to give 0.826 g of the sodium salt. The solid was mixed with MeOH and stirred at room temperature for 2 hours. The suspension was centrifuged and an off-white solid 131 (0.219 g) remained. ³¹P NMR: 15.57 (s), 15.48 (s) (mixture of cis/trans isomers). LC-MS (ESI): 511.2 (M−Na+).

Section 3. Conversion of Bisphosphonate Cyclic Acetals to Bisphosphonates After Intravenous (IV) Administration of Cyclic Acetals and Exposure of Bisphosphonate after Oral Administration of a Bisphosphonate Cyclic Acetal in Fasted and Fed Rats

Male, Sprague-Dawley, rats weighing approximately 200-400 g were studied.

Formulations:

All formulations were prepared within approximately 1 hour of dosing.

Oral (PO) and Intraduodenal (ID) Dosing:

The appropriate test article formulation was administered to each animal as a 17 micromole/kg, 2 mL/kg dose solution in 0.6% methylcellulose/0.2% Tween 80® by oral gavage. Alternatively, animals were dosed with a 17 micromole/kg, 1 mL/kg dose solution in saline through a cannula into the duodenum. Animals in the fasted groups were fasted for approximately 4 hours after dosing and were returned to ad libitum access to food thereafter. Animals in the fed groups had access to food ad libitum for at least 2 hours prior to dosing, and throughout the day post dose.

IV Dosing:

Generally, animals were administered a 1.7 micromole/kg, 2 ml/kg IV dose (tail vein) of the appropriate formulation using a syringe and attached butterfly needle. All animals remained fasted for an additional 4 hours post dose and were returned to ad libitum access to food thereafter.

Urine Sample Collection:

Urine samples were collected into refrigerated plastic conical tubes at approximately 4, 8 and 24 hours post-dose. At the end of each collection period, samples were weighed and transferred to a −70° C. freezer for storage until analyzed.

Conversion of Risedronate Cyclic Acetal to Risedronate after IV Administration:

The absorbed risedronate is stable in vivo and is not metabolized. After IV administration of risedronate to rats, about 60% of risedronate binds to bone and about 40% of risedronate dosed is excreted in urine. When risedronate cyclic acetal compounds are administered intravenously to rats, a percentage of the cyclic acetal can remain intact and can be excreted in urine while a percentage of the cyclic acetal can be converted to risedronate in vivo. Assuming risedronate formed in vivo has the similar tissue distribution profile as described above, about 40% of risedronate generated in vivo will be excreted in urine and about 60% of risedronate generated in vivo will bind to bone. Thus, the percentage of the cyclic acetal which is converted to risedronate in vivo is estimated using Formula A:

$\begin{matrix} {{{Amount}\mspace{14mu}(\%)\mspace{14mu}{Risedronate}\mspace{14mu}{converted}\mspace{14mu}{from}\mspace{14mu}{Risedronate}\mspace{14mu}{Cyclic}\mspace{14mu}{Acetal}} = {\frac{{Amount}\mspace{14mu}{of}\mspace{14mu}{Risedronate}\mspace{14mu}{recovered}\mspace{14mu}{in}\mspace{14mu}{{urine}/0.4}}{{Amount}\mspace{14mu}{of}\mspace{14mu}{Risedronate}\mspace{14mu}{Cyclic}\mspace{14mu}{Acetal}\mspace{14mu}{dose}} \times 100\%}} & {{Formula}\mspace{14mu} A} \end{matrix}$

Risedronate cyclic acetal compounds were administered intravenously in saline (0.9% sodium chloride). The amounts (percentage) of the cyclic acetal compounds converted to risedronate were calculated and are summarized in Table 1.

For example, when Example 82 was dosed in rats, 50% of the dosed cyclic acetal was recovered, and 43% of the dosed cyclic acetal was converted to risedronate (calculated using Formula A). In some cases, for example with Example 29, the percentage of cyclic acetal converted to risedronate was calculated to be more that 100%. While this may be caused by an inaccuracy in measuring small quantities of the compound in the samples, it, nonetheless, shows complete or nearly complete conversion to risedronate.

As summarized in Table 1, exemplary cyclic acetal compounds exhibited the spectrum (slow to fast) of conversion rates from risedronate cyclic acetal to risedronate in vivo after IV administration of the cyclic acetal compounds to rats. For example, dosing Examples 28, 29, 30, 33, 105, 47, 63, 79, and 83 in rats resulted in very low urinary recovery of the cyclic acetal, demonstrating rapid rate of conversion of the cyclic acetals to risedronate in vivo, i.e., conversion quickly to risedronate. In comparison, dosing Examples 32, 40, 45, and 82 in rats resulted in significant amounts of cyclic acetal recovery (about 50% or more of the cyclic acetal compounds were recovered after dosing) indicating relatively slow rates of systemic conversion of the cyclic acetal to risedronate. Examples 36, 50 and 62 (trans) demonstrated both systemic exposure of the cyclic acetal and risedronate suggesting both stability of the cyclic acetal and conversion to risedronate in vivo.

TABLE 1 Risedronate Cyclic Acetal Urinary Recovery and Amount Converted to Risedronate after IV Administration of Risedronate Cyclic Acetals to Rats Amount of Cyclic Amount Converted to Compound Administered^(a) Acetal Excreted^(b) Risedronate^(c) Example 28 0 106 (15)^(d) Example 29 (trans) 1.0 (41) 50 (13) Example 30 0.1 (82) 98 (52) Example 32 (trans) 77 (13) 7.1 (7.0) Example 33 (trans) 0 84 (5.6) Example 105 (trans) 5.7 (52) 81 (30) Example 29 (cis) 3.6 (37) 130 (43) Example 36 27 (17) 69 (7.0) Example 39 30 (28) 12 (12) Example 40 79 (10) 4.0 (32) Example 43 16 (19) 72 (27) (mixture of cis/trans isomers) Example 45 67 (6.6) 9.3 (35) (mixture of cis/trans isomers) Example 47 4.8 (27) 16 (29) Example 50 (trans) 45 (9) 76 (16) Example 54 11 (26) 42 (14) Example 62 (trans) 16 (17) 80 (5.5) 10 (22) 75 (12) 13 87 Example 63 (trans) 3.3 (57) 33 (26) Example 70 22 (22) 75 (37) Example 75 48 (20) 56 (31) Example 79 (trans) 0.3 (220) 43 (27) Example 81 25 (54) 50 (24) Example 82 50 (10) 43 (10) Example 83 2.3 (114) 55 (16) Example 96 16 (15) 25 (27) Example 98 31 (47) 44 (68) ^(a)dose = 1.7 micromole/kg; ^(b)values are % of administered dose excreted in urine; ^(c)values are % dose converted from cyclic acetal as per Formula A; ^(d)Coefficient of variation (% CV).

TABLE 2 Bisphosphonate Cyclic Acetal Urinary Recovery and Amount Converted to Bisphosphonate after IV Administration of Bisphosphonate Cyclic Acetals to Rats Compound Amount of Cyclic Amount Converted Bisphosphonate Administered^(a) Acetal Excreted^(b) to Bisphosphonate^(c) Risedronate Example 62  16 (17)^(c) 80 (5.5) (trans) 10 (22) 75 (12)  13 87 Unnamed Example 129 7.1 17.5 Zoledronate Example 128 51.2 0 ^(a)dose = 1.7 micromole/kg; ^(b)values are % of administered dose excreted in urine; ^(c)values are % dose converted from cyclic acetal as per Formula A; ^(c)Coefficient of variation (% CV).

In the experiment described above, risedronate urinary excretion data revealed a slower risedronate release rate into the bloodstream from Example 62 (trans) than from risedronate. After Example 62 (trans) administration, risedronate urinary excretion was significantly higher at later urine collection times (i.e., 4-8 or 8-24 hours) than after risedronate administration, see Table 3 and FIG. 1.

TABLE 3 Urinary recovery of Cyclic Acetal and Risedronate after IV dosing in Rats Amount excreted Compound Compound (nmol) by collection time administered^(a) measured 0-4 hours 4-8 hours 8-24 hours Example 62 Risedronate 105.6 23.3 33.2 (trans) Example 62 58.1 1.3 0.74 (trans) Risedronate Risedronate 170.2 11.6 14.3 ^(a)dose = 1.7 micromole/kg. Exposure of Risedronate after Oral Administration of Risedronate Cyclic Acetal

Example 62 (trans) and risedronate were administered via intraduodenal (ID) and oral administration to fasted and fed rats. Similar to the procedure described above in relation to the IV study, the urine of the rats was collected, and risedronate was recovered from urine. Risedronate exposure following ID and oral administration was calculated as percentage of the recovered risedronate from the dosed cyclic acetal (Formula A), and the results were compared to that from dosing with risedronate, See Table 4.

Administration of risedronate orally to fasted rats generally results in risedronate exposure of less than 1% of dose as estimated by urinary recovery. Administration with food (i.e., fed rats) causes an extensive reduction of risedronate exposure as compared to fasted rats.

ID administration of Example 62 (trans) to fed rats resulted in greater risedronate exposure (as percentage of the dose) than when risedronate was administered ID to fed rats. Thus, Example 62 (trans) was less susceptible to the food effect than risedronate.

Therefore, these experimental results suggest that oral administration of bisphosphonate cyclic acetal compounds results in improved bisphosphonate exposure under fed conditions.

TABLE 4 Summary of Urinary recovery of Cyclic Acetal and Risedronate after IV, Intraduodenal (ID) and Oral (PO) (fasted and fed) dosing to Rats Compound Adminis- Amount ID^(b) ID^(b) Oral^(b) Oral^(b) tered Excreted IV^(a) fasted fed fast fed Risedro- Risedro- 39  0.49 (23)^(e) 0.012 0.13 0.003 nate nate^(c) 36 (13)  0.57 (4.5) (50)  0.28 (29) Exam- Exam- 16 (17) 0.046 (118) 0.028 0.002 0.016 ple 62 ple 62^(c) 10 (22) 0.092 (36) (26) (trans) (trans) 13 0.33^(f) (25) Risedro- 80 (5.5)  0.25 (44) 0.07 0.07 0.022 nate^(d) 75 (12)  0.34 (14) (24) 87 0.53^(f) (21) ^(a)dose = 1.7 micromole/kg; ^(b)dose = 17 micromole/kg; ^(c)values are % of administered dose excreted in urine; ^(d)values are % dose converted from cyclic acetal as per Formula A; ^(e)Coefficient of variation (% CV); ^(f)dose = 85 micromole/kg.

Section 4. Bone Density Study of Risedronate and Risedronate Cyclic Acetal in Rats.

The effect of the compounds (Example 62 (trans) and Example 128) on in vivo bone resorption inhibition and mineralization inhibition was evaluated in the Schenk Model, an animal model system known in the field of bone metabolism. The general principles of this model are disclosed in Shinoda et al., Calcif. Tissue Int., 35: 87-99 (1983); and in Schenk et al., Calcif. Tissue Res. 11: 196-214 (1973).

Male Sprague Dawley rats approximately 6 weeks old with weights ranging between 120 and 150 grams were placed into groups based on body weight, with 4-8 animals per group. All groups received treatment by subcutaneous injection (SQ) once daily for 7 days.

On day 7 after the start of dosing, all animals were euthanized via exsanguination under gas anesthesia and/or CO₂. The right tibia and femur were dissected free and placed in 70% ethyl alcohol.

The proximal metaphysis of the right tibia was analyzed using dual energy x-ray absorptiometry (DXA). This provides information on changes in both cortical and cancellous bone density. The primary end-point for this study was bone mineral density (BMD) in the tibia measured using Hologics QDR-4500 densitometer (Hologics, Inc). Statistical evaluation of data was made using parametric and non-parametric analysis of variance and Fisher's protected t-test to determine a statistically significant effect compared to control animals, defined as the lowest effective (significant anti-resorptive) dose (LED).

The dose which increased (BMD) 20% compared to the vehicle group (D20) was calculated via a logistic dose response relationship, which estimates an efficacy value using all animals in the study (Lundy et al., J. Bone Min. Res. 22 (Suppl. 1): 5443, (2007)).

TABLE 5 Summary of efficacy parameters as estimated in the Schenk Model D20 LED (mcg P/kg) Compound (mcg P/kg) 20%>BMD than control Risedronate 1 1.8 Example 62 (trans) 3 5 Zoledronic acid 0.1 0.1 Example 128 1 0.5

As confirmed in the Schenk Model, all four compounds increased bone density in the rat proximal tibial metaphysis. The fact that Example 62 (trans) and Example 128 were efficacious provides evidence that the active bisphosphonate was released into the blood prior to urinary excretion.

When ranges are used herein for physical properties, such as molecular weight, or chemical properties, such as chemical formulae, all combinations and subcombinations of ranges of specific embodiments therein are intended to be included.

The disclosure of each patent, patent application, and publication cited or described in this document are hereby incorporated herein by reference, in their entirety.

Numerous alterations, modifications, and variations of the preferred embodiments disclosed herein will be apparent to those skilled in the art, and they are all anticipated and contemplated to be within the spirit and scope of the claimed invention. For example, although specific embodiments have been described in detail, those with skill in the art will understand that the preceding embodiments and variations can be modified to incorporate various types of substitute, additional or alternative materials. Accordingly, even though only a few variations of the present invention are exemplified herein, it is to be understood that the practice of such additional modifications and variations and the equivalents thereof, are within the spirit and scope of the invention as defined in the following claims. 

1. A compound of Formula III,

or a pharmaceutically acceptable salt thereof, wherein R₁, R₂, R₃, R₄ and R₅ are each independently a) hydrogen; b) halogen, —CN, —CF₃, or —NO₂; c) C₁-C₈ alkyl or C₁-C₈ haloalkyl; d) C₂-C₈ alkenyl or C₂-C₈ haloalkenyl; e) C₂-C₈ alkynyl or C₂-C₈ haloalkynyl; f) optionally substituted aryl or optionally substituted heteroaryl; g) —C(O)R₆; h) —C(O)OR₆, or —CO₂R₆; i) —OR₆, —O-L-OC(O)R₆, or —O-L-OC(O)OR₆; j) —OC(O)R₆, or —OC(O)-L-OC(O)R₆; k) —OC(O)OR₆, —OC(O)O-L-C(O)R₇, —OC(O)O-L-C(O)OR₇, or -L-OC(O)R₆; l) —C(O)NR₆R₇, or —CNR₆R₇; m) —OC(O)NR₆R₇, —OC(O)N(R₆)-L-OC(O)R₇, —OC(O)O-L-(R₆)-L-C(O)R₇, —OC(O)-C(R₆)(R₇)-L-OC(O)R₈, —OC(O)N(-L-OC(O)R₇)(-L-OC(O)R₈); n) —SR₆, or —NR₆R₇; o) —NR₆C(O)R₇; p) —NR₆C(O)OR₇; q) —NR₆C(O)NR₇; r) —OSO₂R₆; s) —SO₂OR₆; t) —SO₂R₆; u) —NR₆SO₂R₇; v) —SO₂NR₆R₇; R₁ and R₂, R₂ and R₃, R₃ and R₄, or R₄ and R₅ taken together form an optionally substituted 4- to 8-membered carbocyclic or heterocyclic ring, wherein the ring is saturated, unsaturated or aromatic; R₆ is independently hydrogen, C₁-C₈ alkyl, C₁-C₈ haloalkyl, C₂-C₈ alkenyl, C₂-C₈ haloalkenyl, C₂-C₈ alkynyl, C₂-C₈ haloalkynyl, an optionally substituted 4-8 membered saturated carbocyclic or heterocyclic ring, optionally substituted aryl, optionally substituted heteroaryl, -L-optionally substituted aryl or -L-optionally substituted heteroaryl; R₇ and R₈ are each independently hydrogen or C₁-C₈ alkyl; and L is C₁-C₈ alkyl; or R₆ and R₇ taken together form an optionally substituted 4- to 8-membered carbocyclic or heterocyclic ring, wherein the ring is saturated, unsaturated or aromatic; and R₉ and R₁₀ are each independently hydrogen, halogen, oxygen, C₁-C₈ alkyl, C₁-C₈ haloalkyl, C₂-C₈ alkenyl, C₂-C₈ haloalkenyl, C₂-C₈ alkynyl, C₂-C₈ haloalkynyl, optionally substituted aryl, optionally substituted heteroaryl, —OR₆, —SR₆, —NR₆R₇, —(C₁-C₈ alkyl)-NR₆R₇, —(C₁-C₈ haloalkyl)-NR₆R₇, —(C₂-C₈ alkenyl)-NR₆R₇, —(C₂-C₈ haloalkenyl) -NR₆R₇, —(C₂-C₈ alkynyl)-NR₆R₇, —(C₂-C₈ haloalkyl)-NR₆R₇, -L-R₁₁; or R₉ and R₁₀ taken together form a monocyclic or bicyclic optionally substituted carbocyclic or heterocyclic ring, wherein the ring is saturated, unsaturated or aromatic; wherein R₁₁ is optionally substituted aryl or optionally substituted heteroaryl.
 2. The compound of claim 1, wherein R₉ is hydrogen, oxygen, —F, —Cl, —CH₃, —OH, —SH, —NH₂, —CH₂—R₁₁, or —N—(C₁-C₈ alkyl); R₁₀ is —Cl, —CH₃, —S-phenyl, —S(p-chlorophenyl), —(CH₂)_(q)NH₂, —(CH₂)_(q)NR₆R₇,

q is an integer from 0 to 8; R₁₂ is hydrogen, —OH, C₁-C₈ alkyl, —CH₃, or —F; and R₁₃ is hydrogen, —OH, C₁-C₈ alkyl, —OCH₃, —OCH₂-phenyl, —CF₃, —NH₂, —F, or —Br.
 3. The compound of claim 2, wherein R₁₀ is —CH₂CH₂NH₂, —(CH₂)₃NH₂, —(CH₂)₂N(CH₃)((CH₂)₄CH₃),


4. The compound of claim 2, wherein R₉ is —OH.
 5. The compound of claim 1, wherein R₉ is hydrogen, —F, or —Cl; R₁₀ is

R₁₂ is hydrogen, —OH, C₁-C₈ alkyl, —OCH₃, or —F; and R₁₃ is hydrogen, —OH, C₁-C₈ alkyl, or —F.
 6. The compound of claim 5, wherein R₉ is hydrogen or —F; and R₁₂ and R₁₃ are each independently hydrogen, —OH, —CH₃, —CH₂CH₃, —C(CH₃)₃, or —F.
 7. The compound of claim 5, wherein R₉ is hydrogen or —F; and R₁₂ and R₁₃ are each hydrogen.
 8. The compound of claim 1, wherein R₁ and R₅ are each independently halogen; R₃ is —OR₆, —O-L-OC(O)R₆, —O-L-OC(O)OR₆, —OC(O)R₆, —OC(O)-L-OC(O)R₆, —OC(O)OR₆, —OC(O)O-L-C(O)R₇, —OC(O)NR₆R₇, —OC(O)N(R₆)-L-OC(O)R₇, or —OC(O)N(-L-OC(O)R₇)(-L-OC(O)R₈) and R₂ and R₄ are each hydrogen.
 9. The compound of claim 1, wherein R₁ is —OR₆, —O-L-OC(O)R₆, —O-L-OC(O)OR₆, —OC(O)R₆, —OC(O)-L-OC(O)R₆, —OC(O)OR₆, —OC(O)O-L-C(O)R₇, —OC(O)NR₆R₇, —OC(O)N(R₆)-L-OC(O)R₇, or —OC(O)N(-L-OC(O)R₇)(-L-OC(O)R₈) one of R₂, R₃, R₄ and R₅ is halogen, —CF₃, C₁-C₈ alkyl, phenyl, —OR₆, or —C(O)OR₆; and each remaining R-group of R₂, R₃, R₄ and R₅ is hydrogen.
 10. The compound of claim 1, wherein R₃ is —OR₆, —O-L-OC(O)R₆, —O-L-OC(O)OR₆, —OC(O)R₆, —OC(O)-L-OC(O)R₆, —OC(O)OR₆, —OC(O)O-L-C(O)R₇, —OC(O)NR₆R₇, —OC(O)N(R₆)-L-OC(O)R₇, or —OC(O)N(-L-OC(O)R₇)(-L-OC(O)R₈) one of R₁, R₂, R₄ and R₅ is halogen, —CF₃, C₁-C₈ alkyl, phenyl, —OR₆, or —C(O)OR₆; and each remaining R-group of R₁, R₂, R₄ and R₅ is hydrogen.
 11. The compound of claim 1, wherein R₁ is —OR₆, —O-L-OC(O)R₆, —O-L-OC(O)OR₆, —OC(O)R₆, —OC(O)-L-OC(O)R₆, —OC(O)OR₆, —OC(O)O-L-C(O)R₇, —OC(O)NR₆R₇, —OC(O)N(R₆)-L-OC(O)R₇, or —OC(O)N(-L-OC(O)R₇)(-L-OC(O)R₈), and R₂, R₃, R₄, and R₅ are each hydrogen.
 12. The compound of claim 1, wherein R₃ is —OR₆, —O-L-OC(O)R₆, —O-L-OC(O)OR₆, —OC(O)R₆, —OC(O)-L-OC(O)R₆, —OC(O)OR₆, —OC(O)O-L-C(O)R₇, —OC(O)NR₆R₇, —OC(O)N(R₆)-L-OC(O)R₇, or —OC(O)N(-L-OC(O)R₇)(-L-OC(O)R₈) and R₁, R₂, R₄, and R₅ are each hydrogen.
 13. A pharmaceutical composition comprising a compound of claim 1 or a pharmaceutically acceptable salt thereof and a pharmaceutically acceptable carrier.
 14. The pharmaceutical composition of claim 13, wherein the composition further comprises at least one pharmaceutically active ingredient selected from the group consisting of: an anti-inflammatory, an immunomodulator, a chelator, a musculoskeletal anabolic agent, and a combination thereof.
 15. A method of treating osteoporosis, rheumatoid arthritis, osteoarthritis, Paget's disease, or alveolar bone loss comprising administering an effective amount of a compound of claim 1 or a pharmaceutically acceptable salt thereof to a patient in need of such treatment. 